[@kishin asura]
The thing is, with these new layer of reality, each has their own multiverse, alpha, omega, and so on. When one's destroyed, it tends to only range from that one, as most likely alphas would stop an omega from other realities, and so on. infinite possibilities won't lead to a wipe of all realities, for in some reality, something to stop such an event must exist somewhere, as due to the law of infinite probability. So, your fears are put to rest via the logic of what spawned them :D