That is pretty much a tour de force presentation you have there, Charlie Roy, on the arguements for a Cork to Brussels flight. Hope it comes to pass. Like with the relatively short flight time to Amsterdam you would think that a Brussels flight would be worth another punt in terms of risk at even at a three or four weekly frequency? Crikey, even two a week would do for a start. Brussels Airlines have now gobbled up Virgin Express - is that correct? You would think the availability of more frames would help the case for Cork?
Have you made any contacts with the local airline people in Brussels to ascertain their views? If not, might be worth a try?
There are two bus services from Cork Airport to the city. The Skylink service and the state bus company service, Bus Eireann. Both have reasonably good frequencies. Depends on where you are going before deciding whether a taxi is worth the extra cash.
As for runway issues, weights and diversion rates to Cork the posting by jiffajaffa is to my mind very interesting. Quietly says it all.