Upcoming... The DVideo. Will it replace Youtube?
My guess - no, however with the production of open-source technology it will be developed to great heights. I think we will see a large upward trend considering we're able to view the popularity and status of certain users but the privileged rights will more than likely begin to drive users away considering they may be stuck at a low power status for a long time.
With development though, we can predict it will soon become a very hot video app and I think it has great potential.