As long as CV's are used as they are, they will continue to get sunk.
Been brought up many times. They operate too close to shore. They operate in range of enemy bases with ord up and shore batteries unmolested. They operate with no high, mid, or low CAP. They have no picket destroyers or patrols for early warning. They operate off an enemy base with no one minding the helm (too busy vulching). There are supposedly some blue plane/CV based squads out there, but I rarely see CV's used as anything but springboards for base vulching.
Me? I like sinking CV's with flights of Ki-67's. It's usually pretty easy.
Bring back a LW arena with big maps, add a second CV to TG, and remove the arena cap. You *might* see TG's last a bit longer under those conditions, but I doubt it.