I mean I think I broadly agree?
Developers with a full team, budget and publisher resources are definitely going to be in a different league compared to fresh solo devs. This is true of all genres though, right?
Kinda struggling to articulate what I'm thinking here. It doesn't help that my view of the market is heavily distorted as I lack hardware, time and funds to have played most of anything in the past 5, 10 yrs, but I've seen a few platformers gain traction. Penny's Big Breakaway I've seen get some coverage, for example, and pseudoregalia as well. though the'yre both 3d.
I dunno, I haven't spent much time reading the mags or sites recently but it seems like there's a cycle of styles (soulslikes, DOTAlikes, deckbuilders, survivorlikes) that have kinda booms of activity before settling down to a nominal base level. for your 2d metroidvanias it feels like there was a boom of them released 2010-2015, and excitement about them in the media is dying down .
in short, I think your're probably right? but in say, a few years people will be looking askance at rouguelite deckbuilding dungeoncrawlers in the same way. maybe. ??