The politicians would be very interested in the media opportunities of an AI stop over as an indication of "links" with India or elsewhere, where as two, three or four new EI or FR routes, even if they may produce more jobs in and/or investment into the country don't have the same attractiveness for the politicos.
A longer runway is needed. It's key national infrastructure, like a motorway between two major cities, and so, the costs probably shouldn't be lumped entirely onto the airlines. FR will oppose it, because they have no interest in it, but then, with the wind in the right direction they can get their 738's off 34/16. If Ireland inc. wants to connect directly with the "emerging markets" of South America, or India and points east, then, IMHO, either 28 needs extending or 28R needs building.
But relalistically there is never going to be the yields or arguably demand for thousands of seats every week nonstop from DUB to South America or points in Asia.
On Asia for instance, Ethiad offer most of whats needed on this market as it is. Meanwhile while the AI and emerging markets talk is going on, AA, a carrier operating happily from DUB (to the worlds largest economy) since 2005 seem to be heading for the door if earlier posts on this thread are to be believed...is it that a 757 is just not sexy enough to be saved??
Basically my point is that the DAA should just take the less glamorous option and go back to basics. There doesent need to be a total love in with RYR/EIN, but at least make noise that its where they see growth potential. When and if they ever get back to 24million pax per annum, then start broadening the net further afield.