Cheers EGPO, maybe you should start a Ireland West Knock Airport thread if there isn't one already :-)
No one's really against a train link to DSA or anywhere else - the comments are more related to the cost / benefits and whether the presser was in any way serious, or just wanting to publicize the airport.
I take the point that in the UK we are lucky to have so many airports close to our major cities, with good access on the whole. Saying that, the difference in population between the west of Ireland and, say, the North of England means that there's a far greater demand.
One thing about DSA is you can't fly to Amsterdam or Dublin for 35 quid like you can from other airports