I agree that something like this shouldn't even be considered. It would mean that no account would be safe and that anyone could be robbed blindly by a simple vote.
If Steemit Inc actually saw this as a real threat, they could simply vote for 10 of their own witnesses who would guarantee that they retain control. Hopefully they don't feel that their Steem would be safer on an exchange than in a wallet.
On the bright side, if they move their stake to the exchanges, the remaining accounts with staked Steem will get a higher percentage of the inflation. The bad news is that without the inflation to sell, Steemit Inc will have to be looking to other sources for income, including advertisements.
Yup, it would never happen.