With the funding they're willing to put into advertising, and a long term campaign running on this forum will likely mean they will be a big forum, but a competitor? Depends on how you view it. If you're talking in terms of traffic then they might be a competitor, but quite frankly Bitcointalk.org is my home, and I imagine a lot of other users consider this their home away from home. Its not just a forum anymore, and is something which brings out real passion from its users.

If you compare the history, and passion from its users then Bitcointalk.org will always be the top dog in my eyes, and I'm not going to be using any other. Hell, I don't even use Reddit.