I expect a boom of Steemit users that would lounch the price of Steem to the sky. In addition fee-free and almost instant transactions make Steem great for speculation so we can expect even investors' attention.
The keen thing, in my point of view, is to spred Steemit among countries making localizations and translations. Facebook did so and it helped a lot.
RE: WHY YOU SHOULD INVEST MORE IN STEEM