I get the feeling things are changing. The increasing availability of decent imports in off licences suggests that the Irish are thirsty for good beer. I'm certain there's potential scope for plenty of good domestic beers should they appear. One of the problems, at the moment, is that good beer is seen as an elitist thing. This could change though. Any of my Guinness or even lager drinking friends who I've bought a good beer for have appreciated how special it tastes. Most, but not all, of the time they wouldn't be interested in pursuing good beers as a hobby but I think in the right circumstances they can really appreciate a good beer*. I reckon if more craft Irish beers became available, it wouldn't just be the conniscours who drink them.
*any nerds like might be interested to know that the most popular foreign beers with my lager drinking mates were Fullers ESB and Duvel.