I really don't believe that big Youtubers will join and use Dtube. While the monetisation it is just a 7 days limit I don't think that exchange will happen soon... not with the mainstream popular Youtubers that live from all the "free" advertisement they get from their following all over the social networks.
The 7 days limit is a real barrier. That said the earnings here a from pure viewership. Imagine adding decentralized ads to your posts. This is coming soon.
basic attention token?
By "decentralized ads", you mean Basic Attention Token ?
That would be amazing. But also don't You think that the platform need to be more viewer friendly and more simple. Because right now it is built for creators and not viewers.