For now, it is far fetched, but in 5-10 years or so why not? I believe Steemit has potential to do so. Even though if it ever happens that some paying platform becomes a Facebook "killer" I am sure Facebook would adopt and starting to do the same. Or just try to buy the platform to eliminate the competion. They are just too big for anyone right now. They are not affected by Steemit or any other social platform.