I'd say that consolidating and reducing the FRS for the Navy (remember, other services train in the HTs) would not be worth the cost of replacing several 60's after student mishaps. TH-57Bs are cheap, in the six figure column. TH-57Cs are cheap as well, just over $1M a copy. How much is a barebones 60? Yeah, I guess you could consolidate and reduce the FRS for the Navy 60 community, but you wouldn't do away with the HH-65, CH-53E, UH-1N/Y, AH-1W/N FRS. Also, I'm guessing you couldn't reduce the Coast Guard's HH-60 FRS, since their mission is so very different.
Methinks the juice wouldn't be worth the squeeze.