I took a driver improvement course almost 10 years ago, and the instructor stated then that MDSP was going to depart from traffic duties at some point and take on more duties like the FBI, and let MTA take over traffic. Have yet too see the change, but steadily seeing an increase of MTA officers further from the bridge that divides us...
The rumor was that both would merge and the Troopers of the MSP would turn into an investigative agency much like Texas Rangers are for Texas Highway Patrol and MTAP (the more common slang term among LE agencies for the Transportation Authority Police) would assume "Trooper" duties throughout the state.