Bret and Axl both need to get over the past
**** it
can't live your life holding grudges.
To be fair to Bret, he has cooperated with WWE and Vince in the past with the DVD set, HOF, and that one brief promo in 2007. Axl hasn't come close to doing anything with Slash unless you count producing Live Era or the lawsuit prohibiting Greatest Hits from being released.
If he comes back, I'd like to see the heel Bret make an appearance (the post wrestlemania 13 Bret) that was an awesome transformation of his traditionally babyface character. It'd work great too vs the reformed DX. He could even enlist Jericho and they could both bash Shawn Michaels!