The problem with dtube that I see is the team seems to be extremely small and I think a competitor with a bigger team and more experience can easily outcompete dtube and make it so much better. Know that there are many solid teams working on new upcoming video platforms like view.ly that can get huge market share. Of course the video market is huge so many can compete in that space with the current global world population hitting over 10 billion around 2050.
But all these big guys Google, Facebook and Amazon can very quickly move into crypto and change YouTube to have it as a feature or Facebook may fix it into their platform. Since they have so much money they could get the best guys on board super quick. These are big fish companies and they see trends and if something becomes a serious threat then they could make moves fast.
Of course we want to think our little work matters and yes sure it creates a nice system but we shouldn't forget if a real big fish make moves then it can cause massive ripple effect in the whole Blockchain system. But as long as we are ready for anything then it will be all good!