Do those threads prevent serving aircrew from posting?
A lot of them are Nostalgia, Jet Blast and spotters corner threads and as PPRuNe Towers has already said there was and would be again a shriek fest if they were to be moved. Why would current serving aircrew want to discuss "MOD payouts to Civil servants" for instance?
If you look at e-goat, sorry PPRuNe Towers, they have got it right in the way their site is broken down into different sections and I agree this would probably not be possible here but surely if I wanted to look at endless photos of Tornados, Typhoon and Hercules flying through Wales I would go to spotters corner and look there.
Maybe a compromise would be to have more stickys. One for current affairs, one for photos, and one for military Nostalgia.