Thinking ahead is good, but precluding a technology because a particular implementation would have to be changed in 5 years is just flat-out silly for tech. You couldn't ever buy a car with criteria like that. Grasping for straws.
The point is that if you have only x86 and ARM binaries, you can't run them directly on a new architecture. It isn't a matter of changing an implementation.
It's like trying to run a C64 binary today. The only practical way is emulation, which is slow - but thankfully fast enough in this case. In general though, it means new architectures will run more slowly than existing ones. That's not a good thing.