People have been saying Russia will "collapse" since the start of the war, but it's mostly wishful thinking because people want the fantasy of seeing the 'bad guy' lose.
I think the more likely scenario is that if Trump forces the war to a close (or at the very least mediate a limited ceasefire), the first thing Russia will negotiate for, at the very minimum, is its continued occupation of Ukraine's Eastern territories and Crimea; a Demilitarized Zone; and most importantly, Ukraine's preclusion from joining NATO, which was one of Putin's major objectives if not the primary one.
In this scenario, Ukraine will walk out the much bigger loser. Meanwhile, the economic crutch Russia got from its military complex will fade so it will probably spend years picking fights with other non-NATO nations, like the Caucasus nations, just to keep its economy breathing. Imo Russia won't collapse, it'll die a long painful death. Unless its citizens organize a revolution and put it out if its misery.