1. The Coordinator has been shut off before so the network itself isn't depending on it, from what i read its safety reason to keep it on now (like training wheels until the network is strong/large enough on its own) 3. The IXI hub, which is in development right now, will help with that also, as well with protection against seed reuse.

defenitely have a look around their discord, lots of helpfull people there to get your answers.