1632/WMG

Monsieur Gaston will ascend the French throne.
He's the current French heir and hates Richelieu's guts. Also, we just happen to have a bunch of Huguenot assassins running around. Perhaps they will make an attempt on Richelieu, and get King Louis instead. Richelieu, of course, will promptly get the hell out of Dodge. Defecting to the USE would be too obvious, but he could go elsewhere, possibly joining the Dutch Hapsburgs, or even try to carve out an empire of his own in the New World.