> if we wanted a better code base for the same graying user population,
> wouldn't we do a gradual rewrite in some well-disciplined subset of
> C++ instead?
No, everyone has a difference subset so we won't agree. There's nothing
to enforce it automatically. No subset of C++ is nice. And any subset
would probably become invalid as C++ marches ever onwards to every new
buzzword and must-have feature. No. :-)