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The flip side is, for long term adoption, it pretty much has to open source itself.Really? I don't see IntelliJ Idea suffering much from NOT being Open Source. Or even TextMate for that matter, which still has friends even while being mediocre at launch and 7 years late to show any improvement.
>TextMate was suffering from not being open sourced, and hadn't shown any improvement in 7 years. So he open sourced it, and it is now actively developed by the community.
I follow the repo but I don't see any exciting action. Maybe in a few more years (which is my definition of stagnating).
>IntelliJ CE has been open source for quite some time now.
Yes, but that's just a gimmick. All the interesting stuff is in the commercial edition, and it's not like IDEA is managed like an Open Source project, it's just released as one (like Oracle's MySQL).