Well, you can have your decentralized among the few thousand of you (who really care and would stay JUST for the decentralized aspect, itself). I'd rather have slightly less centralized than what's out there (Facebook, Twitter, YouTube, etc) with many millions of active users.
Decentralization for decentralization's sake simply isn't an attractive enough proposition to bring longevity (success) to this, or any, platform, IF by "success" we aim to include anything beyond one percent of one percent of once percent of potential users (at the order of merely thousands of active users).
I'm not in the "more the merrier" camp by any means, but there's a line where you're simply irrelevant as a "get the word out there" platform, and it's WELL ABOVE the 4~8 thousand active user level. It's probably more around the million to 10 million active users, on the low end, 100 million just to be safe.