2 Gens inop
I had a real life situation. Departed with one gen inop (MEL said it was OK) Left the APU gen on for the flight (2 gens ops). On the return (at night) the APU did an "auto shutdown". Now we are down to one gen. We landed within 30 minutes.
There is no way I would continue to fly on one. This aircraft (A320) is very dependent on electrics and hydraulic power to operate. You just don't want to be in a situation where if you lost the last gen ( maybe had to shut down the engine with the good gen for whatever reason) you would have to resort to a RAT power, emergency landing. Common sense.