It will be the rich kids spending the money/perks to buy the BB so they can own the casual players who either don't have the money/perks or wont spend the money/perks to compete with the rich kid. The way I see it, this idea would turn away more people than it would encourage strategic game play; not because the player can use a battleship, but because the player had to pay extra for it.
That being said, I would love to see more variety on the naval side of the game. Shipping convoys, subs, subhunters, Battleships, escort carriers; the list goes on. Some of those things are not feasable right now (subs, landing craft) because of how the game is played or how the game coad works right now. Maybe we will see things added to the MA as the game evolves over time, I have seen shipping convoys in FSO so its not that far fetched.