Had Layton not died we'd have gotten a NDP federal majority. The Liberals are economic centrists, arguably Center right even, but socially left. The idea that centrism is what you need to defeat right wing populism is flat out wrong. Pointing to Corbyn is such a straw man as well. Third wayers are largely responsible for creating the conditions that gave rise to Trump.
Corbyn is going to be the go-to go left failure for a long time because he's an easy example and it's difficult for the left to refute since he embodied what many leftists want in a Democratic party. That's the result of alienating non-leftists in a mainstream party, being very arrogant with their true potential (which happens on the right, too, look at Romney), thinking the country is more left than it is and valuing loyalty over competence. The left don't get to put Corbyn down the memory hole because he's inconvenient to their cause now.
What's strange about Corbyn is that a mistake he made was being centrist about Brexit of all things! But I don't see this happening with Bernie, maybe gun regulations?
Third Way centrist aren't responsible for Trump, either. They provided a bigger fight against him and the GOP then the left ever did. I'm not buying that it's common sense the left is supposed to be our saviour here you're framing it is without backing it up with facts on the ground. Where the fuck were the left in all these decades in congress and presidency? If they're as strong as you imply why are the centrists and moderates constantly eating their lunch when it comes to electing politicians? Liberals were able to gain a Speakership, and they were loathed by centrists for decades, too. So why couldn't the left do the same?
What created Trump was decades of propaganda and building a large network by the GOP itself. Reagan, HW and George W Bush all lead directly to him, as well as Fox News.
We're largely in this mess because of third way centrism that prioritized the status quo at all costs. Among other problems with third wayers, aside from an almost pathological prioritizing of right wing voters, is how they have tended to embrace austerity in the name of 'fiscal conservatism'.
Third Way centrists may be assholes but they knew how to win elections in the US more than the left ever did and still do. They're more to the left these days than the 90's. You misunderstand why centrists are doing, they didn't go to the right because they wanted to they did it as a matter of political relevance on the national scale, which worked! That's the core of Third Way centrism. This ignores why they value right wing voters more than leftists, since right wing voters have power while the left don't. Because they vote in numbers to not get ignored and have enormous political engines the Democrats and the left don't have access to. Nope, they're not doing austerity because they like it, the people in the Democrats who believe that are conservatives (Blue Dogs to be precise, and they're not modern day centrists) centrists and liberals reluctantly do this because they prefer some progress over nothing.
What pray tell is on the table besides the status quo, btw? You left that out of your argument. You're selling something so sell us.
Always a great tool to cut social programs and hobble centrist governments that want to veer too far to the left. We largely have the scars of austerity to thank for the rise of right wing populism across Europe, as in Britain you can track a pretty direct correlation between support for right wing extremism and the severity of austerity impact. Third wayers are so obsessed with continuing the facade that everything is functioning as normal, everything is 'good', 'America is already great', that they end up pushing peole out of their own tents because of it.
It's not as black and white as you're explaining, and the people weren't pushed out many factions wanted them to come in but they refused to join the party unless they ran it, and when they get told they don't have that power in the party they don't take it well. This is a result when voters value being outsiders to the "establishment." You're either an outsider or a Democrat, many people want to be both.
This is partially why the Justice Democrats are having troubles as we speak, some of them pushed too far when many people in the party were desperately warning them not to put the fork in outlet and they get pissed off at the people who are trying to save them when they electrocuted.
The right capitalizes on this by tapping into every negative and toxic impulse that a person has, and lets them blame the 'other', which is easier and more convenient than 'the system is kind of shit' particularly if a person hasn't been given the education or upbringing to not already harbour ignorant opinions.
The right have a great many tools within society to leverage politics for them than this in America. Like in the UK they control the media and have enormous pressure in social groups like churches and patriarchal attitudes, and a system built in their interests which they've manipulated further into there clutches. Democrats haven't had the political might or the years required to pull back 1/10th of it within the government, whether it be in police, the courts, the military and more.