What i would argue here is that Bitcoin is still yet to go mainstream like normal currency but its acceptability is growing fast, and its current market cap is around $10 Billion.
It took many years for Bitcoin to reach here but in case of Steem i would say it would take less time, as it is social media platform with paying out system to normal users. I think Steemit would also help speed up adaptation of crypto currency, also we see new people joining Steemit who have never invested or were never interested in crypto. Money is going to attract more users to steemit for sure as youtube and other similar medias are not paying enough to its users.