Can someone explain what he means?
I used TextMate for a long time. I switched to TextMate 2 as soon as the beta hit. Over the last year, more and more of my peers have switched from TM/TM2 to Sublime Text in large part because it's better maintained than TextMate.
When Allan announced he was open sourcing TM2 I thought the writing was on the wall: TM2 was all-but-dead. I even shelled out for Sublime Text, resigned to learning a new text editor.
Every so often I'd open TM2, though, and each time there were a handful of updates. There were at least 3-4 updates per week!
My expectations were totally dashed. Rather than spelling the end of TM2, open sourcing it resulted in a new-found momentum for the project. I've since switched back from Sublime Text to TM2, just to see how it'll shake out.
For open source projects to succeed, it needs a strong, clear voice and leader and a large community of users (which results in a large enough group of developers willing to contribute).
TM2 has the bonus in that there's an extremely significant overlap between the user base and those who can and want to contribute to development.
The only question was whether there would be someone taking charge and pushing development forward, accepting patches etc...
It looks like that's very much the case.
Will be interesting to watch how far this will go looks like TM2 gets a new upspring.