AMD wasn’t quite “happy” to sell their fabs, it was necessitated because they were facing bankruptcy. People forget but the prevailing opinion was that AMD was going to bankrupt.

I doubt Global Foundries is even in the position to buy Intel, they’d most likely want to give them a cash infusion in exchange for tech or for selling fabs (which intel would probably accept, since their fabs are currently under-utilised… they have too much capacity). That would be good for GF.