I have tossed this idea out before, but here goes. again.
Large 'fleet' carriers are useful for projecting air power, but the picture is changing. They are also the largest surface vessel military targets. Looking back at past wars, it only takes a few hits by bombs, kamikazes, or in the future, guided drones to disable or sink one.
Food for thought.
The future of air power is in flux as well, with unmanned aircraft on the verge of dominating the battle field. Unmanned naval drones are coming into their own as well, and the cruise missile, hypersonic missile, and aerial drone swarm launch platforms are only a thought and prototype away from being serious threats.
Mama said to never put your eggs in one basket,and with vtol capable aircraft, and even STOL aircraft (arrested landings are the ultimate short field landing), smaller vessels with reduced compliments of aircraft could serve as those points of projection of air power. The 'jeep carriers' of the WWII era come to mind, allowing the projection of more limited air power using smaller, cheaper, (and harder to hit) vessels which would allow more points of projection. Today, with GPS and other systems, it should be pretty easy, by comparison to WWII to vector different air groups together for a more massive attack, and that coordination should be easier as well. Add in that those rendezvous will possibly involve more unmanned craft in the future than manned (smaller, pilotless, attack craft) and they would need less vessel to operate from than conventional manned aircraft.
Maybe we have been going about this all wrong, or the concept of the larger carrier is just outmoded or limited in its temporal utility. Maybe there is a place for both.