AFAIK, most of event x86_64 patents are largely expired, or will be within the next 6 years. That said, efforts for a more open platform are probably more likely to be centered around risc or another arm alternative than x86... While I could see a standardization of x86 compatible shortcuts for use with emulation platforms on arm/risc processors. Transmeta was an idea too far ahead of its time.
Sure, but why does the developer environment have to be the same architecture as in production? Think of it as ahead-of-time binary translation if you want to.
These days, even fairly low-level system software is surprisingly portable. Entire GNU/Linux distributions are developed this way, for the majority of architectures they support.
90% of those problems effect people like you and I, developers and power users, not "regular" users of machines who are mostly mobile device and occasional laptop/desktop application users.
I suspect we'll see somebody -- a phone manufacturer or similar device -- make a major transition to RISC-V from ARM etc in the next 10 years that we won't even notice.
Remembering the Mac ARM transition pain wrt Docker and Node/Python/Lambda cross builds targeting servers, there's a lot to be said for binary compatibility.