I'm actually pretty new to Python, using it daily for the past few years, but I do have to say I have a real uneasy feeling about Py3.

Adoption seems very slow from the various libraries, and without those people just won't move over. And if that's the case, then the language will stagnate, along with the myriad of great libraries that make it so excellent.

Python 2.x suits me just fine right now, it is a pragmatic language that lets me get things done quickly and predictably. But I would be lying if I didn't admit to gazing over Ruby's way now and then and thinking that the grass sure looks green over there.