Regardless of how you feel about PHP, I've spent enough time with it that I can make it work and write good code, quickly.
I do want to switch to another language at some point (I'll leave the reasoning for that out of this discussion).
Why switch to Python 2.7 if it's going to be old in a year or two? Even if there isn't a huge difference between 2.7 and 3.x it sounds like it would be a nightmare trying to upgrade any of the old work that I would have done in 2.7. So either I've got some projects that will be on 2.7 forever, or I go through the hassle of trying to upgrade. I'd rather just wait and avoid the whole debacle.
This may not convince you (and I perfectly understand why), but I think it's worth giving Python a shot even if you're fluent in another language.
Really this is down to whether you want to do something in Python now, or you want an excuse not to do it in Python for some time. It's not a bad excuse but it's also not a strong reason to wait.
