Intel and AMD literally cannot manufacture x86 CPUs without the other, their cross-licensing and dependencies go both ways beyond amd64.
If Qualcomm somehow actually convinces Intel to sell, that means Intel is immediately out of business because all they (could) make are x86 CPUs. AMD would likewise become a zombie overnight with only their Radeon GPUs remaining on their catalog.
It's far more likely for AMD to come and bail Intel out if things really came to that.
What's embarassing about this is that Qualcomm could actually go and ask Intel if they're selling without it sounding like a complete joke. That signifies how far Intel has fallen, Qualcomm trolled Intel and actually got away with it.