This is a great post. One can go as far as to say, Dtube may be a game changer. But currently it needs to fight the Goliath (YouTube). Since Google is backing it up, this might be even harder.
At the same time, since steemit is backed by steem coin, it could also happen. After Google took over YouTube, it became harder for people to make money by just posting video. Since you may get money by up-vote, good video makers could join the steem to make it work.
That brings us my speculation to end point. Good Youtubers need to join Dtube. Only then, David (Dtube) can defeat the Goliath(YouTube).