It looks like '23 was the last year for the 800 (the Titan was the last holdout), so that leaves the 550 fan, 650, 850, Boost 850, 9R, and S4 (four stroke). Seems the 600R (race sled) is still around for '24, but I'm pretty sure the 800 is gone. The 550 and 4S are completely different, obviously, but there's no reason that the 650, 850, and 9R couldn't all use the same crank. It doesn't make much sense that you'd make a lighter crank for the 650, then decide it's stout enough for a 900, but not for the 850... I wonder if they don't consolidate and settle on one crank that'll work for all three. Of course, you're left with three different top ends; kind of hard to get around that.
I think the big issue right now is that if the 850 goes away, a lot of people would switch to Doo, or maybe Cat in '25, rather than take their chances with the 900. That could change, but it'd take a couple years at least, and who knows what things look like then... I don't see everybody riding 900s for a while: I don't care about a few extra HP unless it's only costing me a few hundred, not thousand more, and doesn't come at the expense of an engine that won't last and/or costs you in being harder on clutches and NVH and such. Maybe 900s will be there soon, but right now there's only one, and it's not off to the best start.