Intel and AMD have a patent-licensing agreement where Intel licenses their x86 stuff to AMD, and AMD licenses their amd64 stuff to Intel. AFAIK, the moment AMD gets bought by another company, they can no longer use Intel's patents, and the moment that happens, Intel can no longer use AMD's patents. I'm not sure how much of x86/amd64 you can legally implement without infringing on any of these patents, but it might very well result in a really awkward situation.
Sure, the new owners could re-negotiate with Intel, and maybe nothing would change. But who knows? A combined AMD/nVidia might be a sufficient threat to Intel they might pull some desperate moves.
(In some timeline, this turns out to be the boost that makes RISC-V the new "standard" ISA, but I am not so optimistic it is the one we live in.)
Sure, the new owners could re-negotiate with Intel, and maybe nothing would change. But who knows? A combined AMD/nVidia might be a sufficient threat to Intel they might pull some desperate moves.
(In some timeline, this turns out to be the boost that makes RISC-V the new "standard" ISA, but I am not so optimistic it is the one we live in.)