The RAF will have no use for JSF. Let those good old chaps use their "ultimate" now rated, air-to-ground Typhoons for that and leave the Navy with either cat-launched or STOVL JSF.
If JSF is required from a land base, I'm sure the guys who are used to landing on a tiny carrier can handle landing on a non-moving, well-lit, "in the same place when I left it" 8000ft runway.
Navy can then specialise in CAS and air-ground, and RAF can sit and drink tea in crewrooms as per.
Ouch! No jokes aside. We cannot be a powerful country without control of the sea. We cannot do that effectively without carriers; and carriers don't serve much purpose without jets. If you don't get carriers what was the point in the 6bn worth of T45 destroyers.
I guess the simple fact is that losing carriers/JSF will mean losing massive capabilities - and therefore unless suitable alternatives are found cannot happen without narrow minded MPs focussing on the short-term. It happened before.... surely not again.