Some years back, Russell Bynum broke his clutch cable on a trip back to CA from TX. By trying his best to avoid red lights and stop signs, and clutchlessly popping it into neutral when he had to stop, then killing the engine and starting the bike in first gear, he was able to shift without the clutch and make his way safely home. In fact, he wrote about it here and mentioned how whenever he had to leave the highway for gas, food or motel, how it became sort of a game to time the traffic lights to his favor.
It can be done and it's not horribly difficult on a long trip. However, if the bike is used as a commuter amid heavy traffic, then that's an entirely different situation.