I notice that I'm not the only one to have a problem with the rocket launcher weapon swap animation having to play out in its entirety when going prone. To counter this I'd suggest that the launcher itself be rapidly dropped on the ground and the player would have to manually pick it up again. When the player goes completely prone, the primary weapon animation could play so you end up both prone and armed pretty quickly.
That would make it a lot less disadvantageous to play an AT soldier and whilst I've never been a soldier, it'd feel realistic to me to drop the launcher & hit the dirt when under heavy machinegun fire.