Yes, I think this is a sensible response (deferring to the JCVI opinion rather than to popular opinion).
One argument, as they make there, is that there are finite resources and rolling out this vaccine would mean cuts elsewhere. It was only just worth it in monetary terms when it was rolled out for under 1s (and that was after a reassessment - initially that wasn't considered worth it either).
Another argument, which hasn't been made officially, is that the vaccine is still being assessed for effectiveness and safety, and there is no evidence right now that rolling it out to a wider age group would prevent many (or any) cases of Men B. Indeed early data suggest that there hasn't been any decrease in cases in the age group that does get the vaccine - there is certainly no evidence that it works in the field. It could well be the case that, if the Bexsero program were extended, no lives would be saved anyway, but some children would suffer side effects (more severe and frequent with this than other vaccines), and money would have been diverted from other sources.
The point that parents who have had this vaccine must still be aware of Meningitis symptoms, and not assume that their children can't get it (although it is thankfully rare), is also a good one.
A better use of energy and resources would be to do as the MRF suggest and investigate carriage in teenagers. I also hope that better vaccines are in development, perhaps with a chance of wiping out Meningitis completely.