I find python a lot more enjoyable/productive than PHP, but unless you're having major problems with your current code, it seems like porting it would just be a lot of extra work.

I would guess it mostly depends on how much code you have written now (if most of your time has been design/planning, then it might be worth it), and whether or not the people you work with have experience with python/ruby.

Whichever way you go, learning python (or ruby, I suppose) will serve you well in the future.