In the end.......
What if when Midoriya and Shigaraki's fight is over, One For All and All For One cease to exist?
Well... One for All was "born" to defeat All For One... so in the end, the two would end up "disappearing", I think... since OFA's mission would be over...
I also think Shigaraki will die in the end...
Another one I think will die: Dabi. He's quite burned and ''weakened'' in this fight of yours, and he doesn't even care.