MAN is a decade behind the curve having been neglected over these years with the distractions of STN, EMA, BOH, HUY, having had to dispose of two of these, I'd hope they'd not be interested in another.
On the Domestic figures, except for BFS & GLA they are either static or in decline. I'd say they certainly are bleeding some domestic pax to road and rail (Bad news for Flybe) For domestic travellers T3 is too uncomfortable & time consuming & once the stupid APD is factored in, it's rarely a viable option. I certainly would do more domestic flying if it was easier- but it isn't, so I spend a lot of time at Stockport station instead.