Yes, I believe Facebook had something like just a few hundred thousand accounts the first year in existence. It was not until later into year two before it started getting millions of accounts. It was until the years 3-5 is when the real big adoption starting happening. If Steem can successful roll out SMTs and communities that would solve nearly all the problems faced with Steem today, which would open the path 10's of millions of new accounts. Fingers crossed.