I don't think any one IP can. Pokémon would have to bleed fans to other IPs like Yokai Watch, TemTem or whatever little by little, until it makes a dent big enough for them to notice. Can't say I see that happening any time soon either.
I'm not saying it's right, but it's worth acknowledging that they got a pass previously from some simply because they still were including hundreds of unique pokemon. As soon as they blamed how difficult it would be to keep the quality up if they continued to do this, it recontextualized that quality for many many people.
tl;dr if you're gonna say you're cutting pokemon for quality, people are gonna be more critical of that quality