1 - Until grandma isn't able to create an account and use HIVE, we won't see many people using it (For those that don't take time to think: It's a metaphor about ease of use, user interface and user experience)
2 - As long as the big bois stay on their "closed club", and keep on fighting about small and petty things (specially when new and small users are on the other side of the beating), we won't see too many people staying around for long.
It all boils down to one simple word: inclusion.
edit: Also, 90% of world internet users don't care about centralized vs decentralized fight. As long as they are getting value (not only monetary value), no one cares what is under the hood.
I am guessing you mean "is able" - but yeah, the signup could be better. However, it also has to be somewhat secure and the entire cryptosphere has to do better in this regard.
Not sure about the boys club, but there are users that could spend their energy better perhaps.
Sure, but look that the state of the internet and the damage "not caring" is doing to the world.