The best thing about python 3 is that it froze python 2. So right now we have this rock solidly stable python (2.7) and this weird new python (3.x) that not a lot of libraries work with. The point here is that they changed too much in python 3. Basic things like division changed, and many of these changes people disagreed with. People will still be starting projects with 2.7 in 5 years.
Around 40% of python.org Windows downloads last year were of Python 3[1]. This is for something that is less than 5 years old. What do you think the next 5 years will look like? It will be interesting to watch.
