I don't think so because it is really easy to install Python 2 and have both versions installed. I'm already doing that, the difference is that "python" for me

I don't think so because it is really easy to install Python 2 and have both versions installed. I'm already doing that, the difference is that "python" for me is Python 2 and I have to run "python3" to use Python 3. Other than that, I can't see any problem. You can install packages for both versions, the distros usually add a number (ie. python-django, python3-django).