The problem with that is people will have had to back up every individual update ( or at least the ones people will wanna play most of all at the bare minimum ) and find ways to make both java and bugrock edition work without need for an account if mojangles and macrohard ever decide to axe the game at any point.

I have no doubt the majority of updates have been backed up by some data hoarder for Java edition, but I don't know how that would work for bugrock edition.