Re:Cutting features and old syntax? (Score 1)

Python 3 was an attempt to do precisely this. 5 years later, they have a 2.5%-3.5% adoption rate.
http://blog.startifact.com/pos...

You cannot deprecate old language features without risking lock-in on older versions and lack of adoption.

The reason C++11 and C++14 has been a successful movement so far is precisely the ability for old code to continue running on new compilers!