HIVE will be fully centralized

Not quite. Any account can choose which witnesses they want to vote for. On Hive, the distribution is a bit more balanced now that the massive 75-million SteemIt Inc. stake is gone.

This means: Hive is already more fair in terms of decentralization than Steem is currently.

Secondly, as for Hive "censoring" posts, I doubt that will happen. The group that started Hive did so specifically for decentralization. What you're claiming is an "if". Meanwhile, on Steem, posts are actively being censored. No "if", it's actually already happening where SteemIt Inc. has pushed changes to SteemIt.com that hide posts talking about Hive.

If you are worried about censorship, my move would be to go where things haven't been censored yet. Sure, it's early, it may happen in the future, but "may" is a whole lot better than "is".