It can't be that difficult to do a one-off `find . -type f -name '*.py' -print0 | xargs -0 grep 'print '`, change the print statements to functions and add `from __future__ import print_function` can it?
It's better to make multiple breakages one by one than not doing them at all. On a plus side, maybe at some point you'd realize this print statement isn't that important anyway to make thousands of edits all over the world.