I think it has enough traffic for a php forum.
Other forums are not specified php. They have graphic sections.More people are learning photoshop to design their photos or make signatures rather than programming language.
I think if we manage to make Teams for small projects and then make some advertisment for it.It can attrack lots of users.
And Only users with more 50 post can join the team. So if have more post more users will join this forum.