If you don't want to use Python 3, keep using Python 2 through its EOL in 2020+ but why interfere with other people happily using and preferring Python 3 for years now? It is not interfering with you.
Agreed, browser support was probably unrealistic.
However other points still stand.
Python 3 was a mistake. It at the wrong time (too late), and didn't bring enough. The talks, and the time, and drama around it weren't worth to get dict comprehension and unicode support.
A 10x speed improvement (heck, just a 2x) would have been. Better IO handling via something sane like lightweight threads (via an already existing framework like gevent or eventlet). Better packaging. Better default GUI library. Refresh the standard library with something like requests, ipython...
Python had a golden opportunity and it squandered it. There were