ATNotts
I don't want to be drawn into semantics because I don't think this thread is the place for it. However, as you asked, I will answer your points.
Firstly, I do not think the runway extension will have a significant impact on pax numbers at Bhx. The airport management was drawn into a
PR battle where the fact that the runway at Bhx was seen as a bar to its long-term development and standing, always kept it out of the 'premier league' of UK airports. If the extension had been established 20 years ago, well, the story might have been different.
You say 'centric' I say 'metropolitan'. That is purely my choice; to use a word well established in the English language and which clearly refers 'to the chief city of a state or country'. Centric?, look it up...
As for trolling, the word is now being abused. Its origins stem from fishing where lines are drawn in, thus drawing in rhetorical exaggeration.
I hope that helps