With the greatest respect to Gen Davis and other senior Marine officers, their F-35B CONOPS is a very brave proposal.
My prediction is that if and when the UK does get more than the 48 F-35s that have budgets and delivery dates today, most of them will not be Bs - simply because there's no carrier space for 138 Bs, the RAF has no intention of re-inventing its Cold War Harrier operation, and if you have a runway the B is a much inferior aircraft to the A, while also being ~50 per cent more expensive.