Rocket Launcher for the Engineer

[IHateMMOs]

While I was feeding my Siberian Tiger, I though to myself, should the engineer somehow use the AV rocket launchers that the heavy assault uses? A good thing to do is to make it so that the engineer has to swap his primary weapon for a rocket launcher, there-by making him have a weakness against infantry. Would add to the fortification possibilities of the engineer. I honestly don't care whether he gets one or not, I just want to know what you think of its pros, cons, uses, and possible exploitations.