If we don't have any carriers with effective air arms, just who is going to protect HMS Ocean etc with air cover? Or the troops on board? And give air support if they were to attempt any beach landings, carry out operations on land etc etc?
And don't say it will never happen cause you have plan for the battles that you may expect to fight in 10-30 years time. Who says that we will be in America pocket in 5 years time? Can they prove it 100%?
This kind of short sightedness lead the yanks to remove guns from fighters in the 60's which was a big mistake. Of course we would never make that mistake would we??