On your last point 3) steemit.com maybe could be bought, I guess. But it isn't a corporation like "Wal-mart" or "amazon"
the main steem/steemit developers hold a huge amount of steem.  But instead of selling the steemit host servers, they can just sell some of their Steem holdings at anytime.  They can send it to Bittrex and get cash easily.  I don't think a "firesale" can ever happen.

ANd even if Steemit inc did somehow sell out.  All true steemit or steem blogging users can easily move over to one of the other FRONT ENDS that run on the Steem blockchain.  There would be no value in a Steemit that was run by a private organization.

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"The reward system is unique, and probably much more fragile than people realize. If one person figures out how to game it, you can be sure that there will be many others who will follow in his footsteps."
# THIS is why I am standing up.  Haejln is not the first nor will he be the last. but if no one "stops" his bad behaviour, then MANY MANY MANY more will come in to do the same and THEY WILL destroy the platform.