There's no one else to "grow" the audience anymore. Cryptocoins are 100% within the mainstream consciousness.
There are now three kinds of people out there:
1. People who know about Cryptocoins and never trusted them. (They saw the superbowl commercials and decided it was stupid).
2. People who bought in within the last 2 years (because of the big advertising spree) and only know what a 60% loss on their assets feels like.
3. People who bought in _before_ the last 2 years, a very, very small minority of people.
#3 is not enough to return BTC to $60,000+ heights. And with #1 and #2 distrusting the coin now, I dare say its over.
Type #4: "ignorant" people who haven't heard of BTC yet, are completely non-existent now. Superbowl commercials, Cable News, Facebook ads, and more have ensured that everyone has heard of this by now.