Been there, done that. Licked the wounds, learned the lessons. (grin)
Look, I hope Ivan is wildly successful in his venture and that this relocation works wonders for everyone. Honest.
But the bottom line is this. When you are the Leader of a company that is taking other people's money... You. Don't. Go. Dark.
Tell your users what is going on. If you have to go dark, let them know how long and setup autoresponders (my mom even knows how to use them & she's 66). If there are any problems, state your plan to rectify them. And if you're really on the ball, have a Plan B, too.
I guess you can start your own company and make it fail however you like.