You're assuming Nvidia (or Qualcomm) could obtain an x86 license. Why would AMD & Intel invite more competition when they just announced a partnership of sorts to fight ARM?
Qualcomm is one of, if not the #1 Client Vendors for ARM.
Imagine what kind of industry message it would send if Team x86 convinced them to swap sides.
That x86 was open up to new partner members like in the past when there was more competition.
Then, they can use that somehow to force MS to give up on having "ARM support" in Windows, and help solidify x86's hold on Windows.
That would also close out the ARM CPU window for nVIDIA and force nVIDIA to the x86 negotiation table.
It would be up to AMD & Intel to help negotiate terms for nVIDIA's inclusion into the club and how much it would cost for a "Seat at the Table".
We know all Bubbles, pop, especially AI.
Jensen has always wanted to make CPU's, that's a well known aspiration.
Before he dies, he can create a 3rd division within nVIDIA, and make his own x86 CPU's, that would complete his life goals.
Just like how Intel is starting from the bottom on the GPU side, nVIDIA would be nearly starting from the bottom on the CPU side.
Qualcomm would have to adapt their CPU to decode x86, but I'm sure they can figure it out in a reasonable amount of time.