I think ultimately the UK will stick with the "C". I very much get the impression the decision to switch from it came from above MoD/Sec of State for Defence level - ie it was David Cameron's wish to have a carrier the french/usn could operate their aircraft from, and that meant switching to the "C".
Or alternativetely a re-run of the numbers may lead to the whole damn party, carriers and all, being canned. That would get the vote of 2 out of 3 services and the treasury.