As a counterpoint, Pioneer and Modern are both interesting and healthy. Pioneer's getting plenty of play around me (though I am moving in 3 days, so who knows what being halfway around the world will do to my POV there) and is the best it's ever been. Modern is annoyingly the MH2 Block format, but all the same is not so far off from the best it's ever been to play, with diverse decks that do interesting things and lots of disruption and back-and-forth.
AND YET, I am truly offended by this 30th Anniversary expansion, and I'm the target audience in so many ways (other than making 12/15 cards in the new border???? who wants that from this kind of product??????). I think it, much more than the Fortnite-ification of Magic or the sloppy Digital-first design process or the black hole of a EDH-centric R&D, represents a trajectory for the game I am actually worried about, after finding most of the complaints of the last 10 years overblown.
Like those other issues, I'm confident Magic will overcome this.
But unlike something like Universes Beyond, which has fantastic and obvious value regardless of its risks and challenges, I see these 30th Anniversary boosters as a thesis statement. It declares that WotC is merely beginning their exploitation-driven product mentality I had previously believed was at its logical extreme with Collector's Boosters and Secret Lair -- initiatives that I can support, even with their warts.
So even though I'm still confident in the overall health of the game, and my ability to get a playgroup to draft with me when my Cube is drinking age (halfway there babyyyy), I can't imagine we're on a path where the unadulterated growth of Magic continues at this rate without diluting what makes the game so special. It's weird to think, even though the game's got decades of steam left, this may be the peak of the game.