Well, how much you want to spend to keep the Big E in in good reserve shape? I imagine it has need of being refueled. That’s 8 reactors. Not a trivial, or inexpensive proposition. And can reactors be shut down cold, and then mothballed?
Are you going to update radars, comms, and other electronic systems to keep them up to date?
More CVNs are due to retire soon. Best learn how to decommission them.
The biggest issue is going to be the fact that the Big E has 8 reactors while all the new ones have two IIRC.