I can see AMD adding ARM to its portfolio, but not at the expense of x86. They have had such a fierce rivalry with Intel, I think it would go against corporate culture to drop the x86. Maybe phase it out over several years but not just drop it and move to ARM.
I don't think it would make any sense for AMD to drop x86. It's a huge busienss and opportunity for many, many years. However it might make sense for AMD to add ARM to its portfolio for some markets such as smartphones, tablets and ultra low power servers where it has a limited play.
We are so intent on "greening" the planet", and then we waste industry resources, energy, and thousands of man years on redoing something where, in the end "MOV A,B" achieves the same result. **yawn** Let's move on to more productive uses of silicon, and its designers, and leave the 20 year old stuff as "good enough". The monkey playing Solitaire on a tablet, can't tell, and won't care, anyway. Get a life ARM.
There are one or two other sources of x86 processors but not really in the PC space, but if AMD did choose to cease making x86 processors it might raise such monopoly concerns.
It all depends on how your define the market.
But given than Windows software will be able to run on x86 or ARM architecture processors it might well be not cause too much concern.
Also it would seem harsh if Intel was forced into actions by an antitrust ruling because of actions beyond its control by AMD.
im all for AMD making ARM processors or combo x86/ARM processors
but i hate the idea of AMD not making x86 processors, i have a bunch of x86 programs and only use AMD, i would hate to have to use Intel.