I was just reading an article about how the main factor preventing ion propulsion from being more effective is power generated from solar arrays. Solar arrays typically only generate 1-5 kW of power, which severely limits the thrust of ion thrusters. The article also predicted that if solar arrays could generate 100 kW, thrust would be on the order of pounds. Well lets say some magical device could efficiently and compactly generate 1000 kW. And then, 1 GW. Would thrust just keep rising and rising? Would it ever plateau?