I've been kind of following the reunion rumors. A lot of folks think Adler might show up and "Special Guest" eventually and they also are saying that Izzy might be a little nervous about jumping on board until he sees that everyone gets along now, etc. The band basically fell apart because of drug issues. They are all sober now and I just don't see why they can't do this with original members. The only thing would maybe be Sorum and Adler sharing drum duties since Alder didn't play on Use Your Illusion I or II.
I know Axl has had that drummer forever so probably part of the deal.