"Joy" -- I feel like I spend all my time bookkeeping -- which is about the least fun thing imaginable. The guarantees keep me interested, but just barely at this point.
1. Well -- unless I misunderstand, they use STM to emulate a GIL (while actually letting stuff be done concurrently). Which means that it will still be a bit of a hodgepodge messy disaster.
2. I can't speak for Dropbox, but I worked in a shop that bet their future on Python -- and we spent a good bit of effort looking at PyPy ... it was a nightmare if anything went wrong -- a horrific impossible to debug mess.
3. Yep, I added Python to my "won't work on" list of languages (with Cobol, Progress and MUMPS).