That's a completely reasonable concern that even Scorch has had. After all, the ones back home could be shut off and switched on, and as anything with power, it's always susceptible to possible interruption, whether technical or from physical damage.

     "Who can say? If you're going to ask that you may as well ask what happens when these islands stop floating." Because he sure doesn't know the answer to that one either. Well, except for the obvious. He's fairly certain gravity otherwise functions the same here.