Same as PowerPC Mac's, they'll slowly die out. App developers will phase out x86_64 support and people will be "forced" to upgrade to a new machine.Ah, okay, should be more clear. What's going to happen to Intel Mac when apps are more or less ARM based and lack X86_64 code base or even when they want to use an app that's ARM only? Sounds like we are pretty much screwed.
I surely wouldn't suggest anyone to buy an Intel Mac anymore, it looks like the days are numbered.