I'd say that reaching 100% decentralization is difficult. There seems to always be a part that is centralised. For example the frontend https://hive.blog itself is centralised, someone has to own it, if the server behind it goes down it goes down. Ideally, we would want a frontend that is powered by multiple servers, owned by multiple users etc...
About whether someone is VIP in the eyes of Top20 or not, the evidence is for everyone to see. Justin bribed them and overtook steem.
That's why Hive developers need to find a solution to prevent this, things like one user should not be able to vote 20 witnesses to the top.
Decentralization on paper is equivalent to communism on paper.
It's too early. Maybe you are right, maybe you'll be proved wrong in the future.