probably not, I've been in a bunch of cars with busted mounts. Obviously don't leave it for a prolonged amount of time, and don't be hard on the car, take off and stop easy, no sudden stops, racing, etc. The mount is there to keep the motor in place..if it's broken, that means there's room for movement. Since it's only the one broken one, I wouldn't be paranoid about it, but drive with caution. I remember one time my father had 2 busted mounts in his old sable...came out of nowhere. We noticed when he made a very sudden stop, which was followed by a bang....something rather big and important moving around under the hood!
