I have my themes all backed up so as soon as 4.3 drops I will be upgrading. When the JB comes out I'll JB and put my themes back where they used to be. I had enough of waiting to upgrade back when I needed the unlock to use my phone. I enjoy the best of both worlds now.
I'm with BLiNK.
Infact, I may still be going that way, depending on what AT&T does with HSPA+ in my market.
If I chose to remain a iOS user and Apple managed to close all the holes (*giggle*), I'd remain on/ downgrade to the last JB'd iOS. I've got to many JB, but necessary apps to live on team pure.