The worry, naturally, is the trans-Atlantic cruise coming up in October - Losing power is bad enough, but if it happened in the middle of the Atlantic (especially during a peak month for Hurricane season) it could be really bad.
I would not want to be on any dead in the water cruise ship in the middle of the Atlantic for any amount of time. Even Royal Princess which is a large vessel.
It doesn't make any difference if she lost power, but also she has screws (not pods). Queen Mary 2 has pods and rides incredibly well through the Atlantic. I am not sure Royal Princess will feel quite as stable as QM2 does, but she did feel very stable to me when I was on her last year, however.