I don't think this is the end of Steem. Developers may have resigned from Steemit but I believe they still want to contribute to this blockchain and I am hopeful that some other entity would pay for their work soon if Steemit shuts down.
Witnesses, Tron and Justin had a meeting last night and Justin said he does not want to govern the Steem blockchain, he is just a businessman who wants to make profit. He would like to cash out Steemit's ("his") stake and leave, so I see the worst case is only STEEM price drop when Justin starts selling too much STEEM to exchanges...but then again, I don't really trust Justin's words because he has lied so many times since he acquired Steemit
He basically bought Steemit inc to farm Steem then. CEO's who only want to fill their bank account is bad for business.
He is like YT's CEO in away. Both do things that anger their users.
In my opinion Justin Sun is more like Donald Trump. He lies and promises things he knows he can't deliver and always blames others when something goes wrong