May be, may be not.
DTube is a decentralized video streaming platform linked to Steemit which allows users to upload videos easily and make money (or cryptocurrency) via the upvotes or likes on their post. It relies on people's self-governance ability.
Still steemit is an experiment and founder of dtube said it can disappear anytime, because founders are normal people and needs taking care of their expenses and life.
Though we can support and help make it more sustainable as it's the best time to have such platform due to current censorship issues on YouTube