With constraints at LHR Manchester should really be going for it !
There seems to be too much reliance on the airlines themselves!
And what makes you think that MAN are not "really going for it"?
The Airport provides the facilities and the climate for the airlines to operate and "sells" this to the airlines in a number of ways. It also works on the Government to get rid of the regulatory constraints such as bilaterals which constrain some airlines from doing what they want at MAN.
It's then up to the airlines to decide what to do and what is best for them bearing in mind that there loads of other airports touting for their business and they only have limited resources.
In the last couple of years MAN has experienced a resurgence of traffic, so someone must be doing a decent job, especially in the current economic climate.
Suzeman