Is it possible to (electronically) disable an ejection seat?
I am not familiar with the current F-35 ejection seat, much less what design changes, (real or fictional...) might be made by the year 2034, but of the three ejection seat aircraft I flew in the 1990s, none were electronically actuated such that it might be possible to hack into and disable the seat.
While they are mechanically complex, the means of actuation for most seats is actually fairly simple; relying on springs, firing pins, cartridges, and rocket motors.  It would be a very poor design decision in my mind to manufacture a last ditch fail-safe system like an ejection seat that is vulnerable to EMP, or is connected to a hackable network.