If we get up to say 10,000,000 users the users will probably want to buy up Steem and advertisers will want Steem. There is a lot of strength in numbers. I seriously think the Steem ecosystem could be worth $1 trillion someday. Scaling could be a major problem though. I assume we would need massive data centers but we could probably use AWS servers like I guess we already do but I'm not really techy.
If we had 2 million users instead of 1 million that's an additional 1 million people who could buy Steem and boost the price. There is only a 7% inflation rate for Steem which with our growth rate should eventually cause the price to skyrocket.