I don't see that many textmate users dropping it for emacs any time in the near future. Yes, textmate was inspired by emacs, but it tends to appeal to a different crowd.
I did. It was actually TextMate that got me back into Emacs after all these years. I needed something at work on my not-a-Mac that was as good as TM. e and InType were close, but fell into the (sorry in advance for the cliche) uncanny valley, where any minor shortcoming relative to TM was doubly unsettling. It was actually easier to adjust to Emacs than to the also-rans.
Not emacs, but I dropped TextMate for Vim, and was very, very happy to do so. The stagnated development, the closed source and lack of portability, the annoying bugs etc. made it an easy choice.