It would though? A random deus ex machina will happen, even if it makes zero sense, or maybe the fact that happening is written to begin with but just further serves to boost Dio's goals.
Like, Jorge in novel was dying, fated to die, and was meant to die in the story from a metaperspective (he dies in canon), but because he believed in Beyond, a literal plot device showed up and sent him 10,000,000,000,000,000 years into the future into a different universe out of nowhere (Dio also makes use of this to time travel and move between worlds so....).
The worst part about this is, everything you just said wouldn't even happen. If it's so inescapable, it wouldn't ever come to pass, it'd be written so something happens that stops it, or maybe it just doesn't work, or maybe Dio asspulls a new power, or maybe this, or maybe that, but fact of the matter is, a mere universal collapse is a non-threat to Dio with Beyond and the narrative would be written in a way where Dio manages to neg it somehow or it just isn't a factor.
Honestly, I don't think he even needs Beyond given Ultimate Kars could survive in the white flash of the end of the universe 36 times due to his unkillability. And Dio has his immortality.