In the time I've spent propping up the bar at the Bull and Castle I've seen very few requests for the non-macro beers. Most tourists just want Guinness.
Irish people are particularly conservative drinkers because the market is so homogenised. They don't look to see what's available because what's available seldom varies. I think if you want to make a breakthrough you need to take the Porter House approach and not stock common brands. Unfortunately, with insurance costs and ground rents being what they are, that's economic suicide for most non-chain pubs.
The breakthrough, when it comes, if it comes, will be from better quality Irish draught beers getting a foothold in ordinary pubs. Franciscan Well, Porter House and Galway Hooker are leading this. The increase in quality off sales, as Fishamble mentioned, will help sustain the rise. And I believe that the likes of Diageo are genuinely afraid of it. That's something at least.