Ouroboros was basically a giant floating metallic ship....that does absolutely nothing besides spawn Mavericks.
Short of repeating Weil's Ragnarok/ Sigma's Eurasia gambit, I don't see how it by itself was so dangerous. How was Albert going to do anything with it?
Ouroboros Is made from a fuckton of Model W cores, with Albert at its center controlling it. It can spawn mavericks, but im sure it has other gimmicks to it as well. Plus hello, Its made from Model W's. I think its a safe bet that Albert could absorb large quantities of souls that way.
Then, when all is said and done, He uses his Godly Ouroboros A trans and recreates life the way he sees fit.
Actually, I think the main question is not how he was going to reset the world, but more how he was going to repopulate it.