At the very least, the projected number of Ford carriers could comfortably be cut back a bit, for one because the America-Class ships are also able to carry F-35Bs which gives them more utility than previous types. But also with the two QE CVs, the PANG and CdG possibly operating simultanously at one point, Japan having two Lightning carriers and Italy having a proper carrier it's clear that the burden of carrierborne aviation in the western world isn't as concentrated on the US as it once was. And as Ford is more capable than Nimitz was, it may actually be viable and safe some money as well. But I think the USN is required to have a set amount of carriers, however that can easily be circumvented or simply altered to adapt to modern times.