Carrier - $4 billion
Seawolf - $2 billion
I'll take 1 carrier over 2 Seawolves, thank you. Let's entertain this scenario. We're boots on the ground in North Korea or China. Either scenario would place the initial component of the USMC vastly outnumbered. You wouldn't be able to support them with a sub that has "hundreds of UAVs" for very long. They'd need to come back and re-arm. So their long sustained flight time would be negated as their primary role would be fire support.
Some Marines, I'm sure, wouldn't want to admit to a squid that the Navy is good for anything but hauling them around... but the Navy is absolutely vital to sustained ops. How would you also expect to replace the EW capabilities of the Prowler?
Can you honestly say that if you outfitted (I'm assuming here) a bunch of Ohio Class boomers that you'd viably be able to replace a Nimitz class CG in total firepower and operational capabilities? Not only for the Navy, but the Marines as well?
If you said we should replace some boomers nukes with UAVs... bring those in first for precision elimination of SAM/ASM batteries. I'd agree with that. In a sustained conflict though, at this point in the UAVs development, there is no replacement for the total impact a Nimitz CG can have.