Good question....I believe IF Facebook gets a token and starts rewarding users for content creation like Steem, it could create a very difficult situation for us Steemians. I believe Facebook will have a very difficult time initiating anything like that however. For one, they are a publicly traded company, so they have to take shareholders into account. Second, they are huge! Think about the issues SteemIt has, "reward pool raping", crap content getting thousands of dollars etc..., and multiply it by 1,000,000 and in a very public way. I could envision a scenario where if Facebook initiates a Token, it could actually help Steem users and hurt Facebook, as Steem has already gone through the rough times of getting started. It would be totally new for Facebook, but if they used the same concept, it would validate everything on the Steem platform as having merit. And Steem would likely be in the media alot more if Facebook adopts a token. It's like if Apple succeeds, Microsoft does too.
That said, I believe there's room to run in $ terms for Steem especially into 2018. I'm thinking short-term, like over the next year, Steem could double or triple in price...so that's why I'm buying/investing now. Looking for short-term profits. If and when things change in the future, I'll adjust my position.
Thanks for the comments!