If it makes you feel better, they've been dealing with electrical failure for years now. Each engine generates enough to power the airplane. Additionally, there

If it makes you feel better, they've been dealing with electrical failure for years now. Each engine generates enough to power the airplane. Additionally, there are backup batteries and backup generators on board. The 757/767 even has a pop-down turbine as a last resort. Worst case, the power capacities of these systems needs to be beefed up. And like you hinted, flying a large plane without hydraulic power is practically impossible anyways. It's not a huge leap from that to plasma actuators.