Re: Genuine question
No chance (for instance) of flogging it to India who might operate MiG-29Ks off her.
Mig-29K do not require cats - "just" the arrestors. Presumably these would be easier to retrofit than a cat if it came to that.
Given that you can get eight Mig-29Ks for the price of a single F-35B, and that aside from the radar cross-section the two aircraft have very similar performance and operational capabilities, it may actually make economic and military sense to ditch the 35B, buy a full complement of 29Ks for both carriers, use some of the cost savings to add the arrestors and bank the rest.
Not that it is ever going to happen.