If anything, in the future I see iOS (or iPadOS) getting more and more 'MacOS-ified' and not the other way round. As the HW inside iPads get more and more powerful, I could imagine Apple eventually porting MacOS to iPads (and therefore to ARM); not to replace the Intel-based Macs with ARM-powered ones, but to empower iPad users with a much more productive OS. Sure, iPad users wouldn't be able to run x86 binaries, but with Apple incentivizing developers to build x86+ARM fat binaries, the software library available for 'MacOS iPad' users would keep growing over time.