Gainsey, I'll bite.
If someone said to you, "I know, we have a few aircraft sitting around in storage at the moment & we need a quick push to relieve the pressure on the troops in 'Stan, lets use them", you'd probably respond by wondering where the manpower was coming from, what about their training/ currency on type, what about the maintenance, what about the logistics support issues, where's the money coming from, if we borrow people to fill this task wo is going to back fill their other tasks, what about harmony rules etc etc.
Same applies to ships that are laid up. Ships at 48 hours notice need to be fully manned, trained & maintained.
Of course, this sort of capability should be available, (lets call it an Amphibious Task Group & then it might be availble for other maritime tasks, too) but we don't have the money for it to be permanently at 48 hours notice.