If the only thing that makes you excited for gaming is how big of a jump it is in terms of raw power, I'd dare say you're not actually all that excited about gaming (I hope that doesn't come off as antagonising.) How big of a jump you get technologically has nothing to do with how same-y games feels IMO - And for an example, I'd point to Mobile and PC gaming being the place where you see the biggest variety of games, IMO exactly because of this model.
And we were hitting smaller and smaller gains for each gen anyway, it's just bound to happen as you get higher and higher fidelity. You're bound to reach a point where the jump to a new gen is just not all that dramatic anymore.
We're not at that point. Games aren't close to as good as they could be (ignoring budgets).
I'm not that "excited about gaming" because I've been playing the same level of games for 10 years now. It gets stale. The games only vary so much. It's the same sort of systems, physics etc. I have my favourites, and if they're multiplayer I stick to them. I'm not excited for something else that just has a new skin, new soundtrack and reshuffled the mechanics with all the same limitations. Sure, I'll play some indies and smaller scoped fresh titles but, that's not what I sit around waiting for.
I'm more than ready for something new and amazing. And it's not coming for years maybe.
Watching through all the hype and "in-engine" cinematic trailers leading up to the next-gen console release is going to be ... I dunno, bitter sweet? Frustrating?