Grumpy, I can but agree. I went there a few weeks ago with some friends, none of whom were ex RAF, and all came away very underwhelmed. The new WWI/RFC building is excellent but the rest of the place was very much work in progress with very little sense of purpose. Even the shop seemed to be full of tat whilst the small cafe was very expensive.
On the assumption that building land is far more valuable in North London than Lincolnshire, why not move the whole collection up to Scampton, keep the Sparrows there and move the BOB Flt in from Coningsby and turn the place into a living and breathing museum.