This is a tough one for AMD, because while the number of gamers directly affected is low (~1500 daily players on Steam), it hurts the brand badly - people will think other games might lose support also. That kind of FUD is gold for a competitor.
AMD is playing with the fire here.
They aren't particularly old titles, either... maybe this is just me, but most of my gaming time is on DX9 games older and more obscure than that. I'm not in the market for a new GPU now, but this wouldn't encourage me to switch from Nvidia.