The thing is the benefits are not big enough for the costs compared to other more exciting things like self driving cars and machine learning. Also 'make a new

The thing is the benefits are not big enough for the costs compared to other more exciting things like self driving cars and machine learning. Also 'make a new os' is much like 'rewrite vs improve in place'. Most mature engineers do improve in place. New systems research innovations come through improve in place operations. Change a filesystem, change that subsystem and eventually you have a new way of doing things.