I personally use python 3 regularly, along with Qt5 and a few other libraries. I'm pretty indifferent about the usage of each, and I simply don't care about the libraries that don't work in python 3. Considering most of the important libraries have already made the switch, I'd suggest other developers to move to 3 when they get the chance.
Also, it's surprisingly easy to switch. I had roughly 3000 lines of code written in python 2 and only had to change maybe 10 lines to make it work in python 3.
So far the only thing I don't like about python 3 is it seems a lot more picky about string encoding, where even C is sometimes simpler.
At work we have around three web apps using Python 3 already (from 3.3 up). Only the last one started on Python 3.3, and the first two were ported to this version. That required some noticeable amount of pull requests to packages found in the requirements (but usually it was like exception syntax, or print - fixable in few lines). Some more complex apps/libraries are still Python 2 only so not everything can work with 3.X yet.