Sure the B fulfills the requirements for a FCBA, but I don't think it fulfills the requirements for replacing Tornado, or does it? I'm going off what other people have said on that matter. As for AEW, well yes, we won't be getting AEW for it this side of 2020, but what makes you think that the navy wont pursue that in 15 years time? I see all this grumbling about budgets as largely irrelevant because the current budget predicament isn't typical of the overall trend.
Glojo, to me, presents the most convincing argument; why would we restrict ourselves to such a narrow path and with less capable jets? I understand the arguments for the B on sea states but surely if the B was so much more advantageous, the USN would be at least buying a small number...but they aren't and never will be interested in STOVL.