If AMD does not add DRM capability, then the media that requires it simply won't run, so it won't matter to you if you buy AMD or not.
It however will matter to the people who actually want to run DRM enabled media, so these people will only buy DRM capable motherboards.
It also of course matters a great deal to the people who want to make thier media DRM encoded, since they won't bother with the format if there's not enough PC's to run it on. It's the classic chicken before egg problem.
IMO if DRM makes it, there will be a crack available within a couple of weeks. One thing that's noteworthy, is Intel seems to want to keep the details of the implementation a secret, which likely means it can be easily cracked and they know it.
Intel quietly adds DRM to new chips
"Conversely, Intel is heavily promoting what it calls "active management technology" (AMT) in the new chips as a major plus for system administrators and enterprise IT. Understood to be a sub-operating system residing in the chip's firmware, AMT will allow administrators to both monitor or control individual machines independent of an operating system.
Additionally, AMT also features what Intel calls "IDE redirection" which will allow administrators to remotely enable, disable or format or configure individual drives and reload operating systems and software from remote locations, again independent of operating systems. Both AMT and IDE control are enabled by a new network interface controller."
The more worrysome aspect of the "Trusted Computing" cartel, is that in theory only "trusted" computers will be able to speak to other computers on the net. ISP's could start preventing computers without DRM from connecting through their networks.
If you don't run an Approved(TM) OS, then you may be SOL unless there's a work around.