Static typing arguably makes it easier to provide a deeper and more accurate translation, but Python did at least try. And note that's a link to Python's official docs, not a side project or something; 2to3 was created by the core Python team as part of the official upgrade path, not an afterthought.
For whom? Five years is long enough to realize that you might as well try new languages instead of porting all your code base (and maybe some libraries that you need) to the slightly improved but backwards incompatible version of Python.