You say uCrypto.co is less active, but I've had more human interaction there than I've had here. And there are only 18 members there so far, so what does that say about bitcointalk?
2 people seem to have quit already. It's down to 16 members.
It's hard to evaluate service when it has existed several weeks. I don't think any movement is possible if you don't make people changing. This has been a home of the Bitcoin for a while now and this is how it will stay. I mean it's cool to have an alternative, but this will just stay an alternative.
Not to mention a new bitcointalk forum that is coming and where it's invested a lot of money. I just don't see people throwing all off this away for some crypto social network.