Very wishful thinking to think that MSU is gone, MSU will definitely still be around as it still provides the best firepower per points ratio and this will always be true until/unless the do something about it at the codex level. GW appeared to try that with the 2007/2008 books and then discarded it. Also, as noted already, one will also notice that modern military units act just as MSU does, over the last century going from the Company at 80-150 men being the smallest "tactical" element of maneuver, to fire teams of 4-6 soldiers comprising squads of 8-12 in platoons of 30-60, typically with attendant transport, either an armored wheeled vehicle for each fire team or an Infantry Fighting Vehicle for a squad.
Some transport spam may change, but many armies are built very heavily around it, such as Tau, Eldar and Dark Eldar, and they can't do much about it, and many transports are still rather useful as cheap firebases.
that said, the biggest winners of 6E so far, at least to my eyes, are going to be Necrons, 4HP Av13 non-flyer tranports, AV11 flyer transports that don't actually hurt anything if they get shot down, incredibly ability to terminate vehicles with ease, etc.