It's just prolonging the inevitable. Discontinuing support for python 2.7 may give people the spark they need to finally suck it up and migrate their code. But hey, if it's supported another 5 years, why bother.
If people have real compatibility problem to migrate to Python 3, harsh policies will do nothing about that. If I'm forced to rewrite my app I may as well rewrite it in Ruby, Go, Java, or whatever. Especially, if Python developers will prove to be aggressive about compatibility. Why would I migrate to Python 3, just to be forced to rewrite everything in Python 4 next time?
