There also seem to be a few stories going round about Cork-Dublin being restarted.
Remember that single route accounts for about 40% of the passengers lost in recent years and it could be significant. I can't imagine it would come back anything like the levels it was though. Maybe a couple of flights a day to facilitate connections and that would be it. With the motorway completed and improved frequency and time on the train service, it's not likely to be interesting to anyone just going to Dublin.
Still, that frequency could mean 80K passengers a year, which is not something to take lightly.