Consider the potential for civil war in that scenario, and the opportunism of other nations. Consider the consequences of that, and more. Glib ideas are fine, we all have them, but please do yourself a favor and extrapolate a little before it becomes an "obvious solution" to you or anyone else. Never know who you might influence.
Hey, no need to be Sour Grapes, Jimmy. It seems likely to me that Putin eventually meets the same fate he has given so many others. Does that solve all of the world's problems? Nope, but it solves one of the world's problems.