Captain, in terms of the music, I don't know but keep in mind for most tourists to Ireland traditional music is not the lure for going to Ireland. I think most first timers to Ireland do encounter traditional music somehow while there, although it might be mixed with some bad U2 or Daniel O'Donnell covers as well!
The good thing is that they will hear some music though. The point about drink and driving is fine, but I think most people consider a visit to Ireland is not complete without a visit to a pub. I think if the problem of drinking and driving is a problem in Ireland, then you need to toughen up the penalties, damn all the consequences because you are saving potential lives. Tourism will survive, and the music will survive as well. Direct answer to your question, tourism will NOT suffer in Ireland, just look at how many flights come into Ireland on a daily basis.