I think that the customer base of AMD cpu and GPU is exploding thanks to their goodwill to work and provide what is needed for linux and open source drivers, so I don't see why they would reduce their effort when it so easily yield so much positive effect for them.

Almost no one is scared anymore to buy AMD for linux desktop and servers knowing that it normally works well and the same kind of person will be the one doing recommendation for their families and relatives or relative companies even if these one are using windows.