I don't get it. What's the use case for a few core utilities running natively?
I'm with you. Interesting novelty, but I would absolutely not bank on doing anything missions critical with this. Wait 5 years for the excitement to die down and lets see if the team stuck maintaining this is even going to be around anymore. Are they committing to keeping the syscall translation layer up to date with changes in later kernels, etc? Or is this going to turn into another 'You can run Android apps on Windows!' announcement that fizzles out after they realize how much work they've gotten into...
... what changes in later kernels?
Remember the holy edict of Linux kernel development: you don't break userspace.