Some people say they can tell without removing everything. I can't remember how they did so. If the torque struts are bad, the middle mount will wear more quickly as the engine and transmission can now torque (twist) back and forth during both acceleration and deceleration. I suppose if the torque struts weren't bad too long, it'd be OK. Other than that, my own opinion is any extended driving with such a condition will screw up the mount.
How many miles are on your car? If you are near the 100,000 mile mark, it wouldn't be too bad to just change the timing belt and water pump to save on labor later. I can give you links to everything online for MUCH cheaper than you'll find anywhere locally, if you'd like...if that's something you might want to do.