There could possibly be vested interests in Midleton but car dealerships having a say on whether a link link opens or not??? Come on, I don't think so.
This rail link is going to happen and funding has already been approved, in fact one of the reasons Amgen decided on Carrigtwohill was due to the rail link. Amgen are even in discussions with the local authority to locate the rail link station in the grounds of their factory.
As for pollution issues... Little Island/Ringaskiddy pollution affects the whole of Cork City and the general harbour area and Carrigtwohill suffers no more, or no less than any other part of Cork City.
Carrigtwohill is a growth area, zoned for housing and unless there is a complete collapse of house prices generally anyone buying a house there will have no worries.