Too many bases, too few ships

While many are applauding the saving of major shipyards after the recent BRAC process, the question arises will we be able to afford enough ships to populate these bases. This is the dilemma the Navy's new chief is posing :

For the past year, the BRAC process has been a serious threat to the submarine base in Groton, but the new chief of naval operations points to a more long-term concern affecting the future of the installation: the high cost of modern ships and submarines.
Adm. Michael G. Mullen, speaking this week before an audience at the Naval War College in Newport, said that while he is committed to building the new Virginia class of submarines, he has to deal with the high expense of submarines and ships, including new classes of destroyers and aircraft carriers.

The Virginia's cost about $2 billion, the CVN-21 $10 billion and counting, and the DDX Destroyer another $3 billion. They way our budget is going, we may be able to afford one of each. Will this be enough to counter over 400 submarines deployed world wide, many to nations hostile to America?