I've spoken with Zac as well. Dtube is ok, but it's FAR from mainstream. It performs as if it is far from mainstream as well.
The ideal solution at this time would be to have a Dtube account, automate it with your product, and hope it continues to rise in popularity.

It would be difficult to imagine 'just switching' over from YT and Dtube and thinking your reach wouldn't amazingly suffer. It would.