My impression is that the slowness to adopt python3 is mostly about fashion than anything else, not that there aren't solid, technical reasons to stay with python2. The main thing for me is availability of numpy/scipy packages for python 3.

s/fashion/fear/ with a small pinch of missing libraries, as you said (btw i hear numpy is getting there.)

numpy/scipy/matplotlib have been there for about a year, according to http://pythonsprints.com/2011/04/8/matplotlib-python-3-thank...

(I am dragging my feet on this, too.)