My only problem with a Blackbeard vs. Revolutionaries fight is that I don't see Blackbeard's motive. Or the revolutionaries. Neither should have a vested interest in the other, as far as I can tell.
Also, I highly doubt Blackbeard would take Dragon's powers. I'm not sure what Dragon's fruit is, but Blackbeard already has the Yami Yami and the Gura Gura (Darkness and Earthquakes), which are arguably the two fruits with the most raw power, so I'm not sure what Blackbeard would want with Dragon's.