I doubt Microsoft will simultaneously support two different enterprise architectures. Windows 11 compatibility requirements remain worlds apart from breaking x86 functionality. Many Fortune 500 businesses reliant on legacy pipelines would vote against your presumptions with their wallets. Like it or not, Intel's existential problems lie in the desktop & server markets, not mobile computing.I have not forgotten about legacy windows/x86 software. But legacy software support does not mean that Microsoft can’t offer ARM software or the entire planet has to stay on x86/64 for them to service that market. I doubt Microsoft will stop making Intel versions of windows and office or any of their other core software in any of our lifetimes, but that does not mean these will be the only versions they will make. Companies that have been reliant on legacy software, until now, have been doing so while still getting generation over generation performance increases due to hardware advances and may start reevaluating those decisions when that train starts to slow. Legacy software entrenchment in business has also been eroding on many fronts over the years and operating system support alone is not going to save it. Nor should it. Even Microsoft has done a lot with Windows 11 to make a demarcation point as to what they considered unsupportable cruft like nixing NTVDM support and other things that make continuing to use 16 and 32-bit software painful.
It won’t take a monumental shift in the market for Intel to be in trouble. It will just take enough people liking light, fan-less, all-day-running notebooks that run windows and office respectfully well alongside a few common programs to sour their fortunes. Over a year ago Intel stock fell 6% on rumors that Microsoft was going to design their own server and laptop chips. Now imagine how bad that would be if it were Dell or HP and you will understand why Intel is spending million on ads to downplay MacBooks.
I don't think you understand Intel's business model, which heavily depends on desktops & servers. Long-term OEM contracts & the relative competitiveness of Intel's mobile chips versus desktop ones mean Intel has bigger fires to fight, i.e., AMD. In this context, Apple's business remains a rounding error to Intel, albeit a prestigious one, which explains the recent campaign to woo Cupertino back.I don't think any company wants to lose 10% of one of their major markets. Anyone who thinks Intel is OK with losing Apple as a customer really doesn't understand how business works. Apple is about 1/2 of Dell for notebooks.