Gotta say that I somewhat agree with this, if battleships weren't meant to kill everything in their path then what were they made for? They certainly aren't mobile bases as they are only found within house territory (Save invasions). They also aren't made for planetary conquests as carriers do a better job. The only thing I can see them useful for is orbital bombardment, but players can't do that.
I say just remove them. Let cruisers be anti-cap and carriers be...carriers.
EDIT: Better idea, let them be RP only ships like the Bretonian Cruise Liner.
The rare sub-species of human that gives out info that nobody actually cares about...