First of all, Sl will be closed if becomes unprofitable no matter if there is SL2 or not, it buisness for them and noone will pay for it from personal pocket, or will you?
Second, with an attitude like yours, you kill SL yourself, becose if you leave or/and stop buying anything you make it unprofitable.
Noone say SL will be shut down, they bring new grid online and they will work together, noone force noone to move, if people wanna stay in old SL best thing to do is stay, if noone move to new SL and new SL will be unprofitable they shut down new SL not old, so it all depends of users, noone force people to move even LL, if they try shut down old Sl to force moving they lost twice, and they know it.