The accounts figures are not to be treated as 1 = 1 organic user. There are probably more dead/idle/shadow/bot accounts than actual user accounts. Even if steemit reaches a mainstrem audience the actual user base will be considerably lower.

Regarding the video. I would be excited about this if the 3 individuals in the video were part of steemit.inc. However they are not. As valiant as their efforts are. It's a lost cause. Lost because this is a very niche initiative. The bots will simply make such an initiative pointless or not even worth the time a person puts in.

Curation on steemit is an illusion. While there are many actively manually curating, there are more and more users utilizing the bot voting system. There are also more and more bots coming into existence offering the same service. It is only a matter of time before manual curation is completely whitewashed, leaving steemit to exist as just another advertisers playground.