Sligo trains using the Midland line couldn't stop at Drumcondra - this would be a major drawback if and when Metro North is built. P7 is also a pain in the rear to get to versus Platform 4.
I would like to see through running between Wexford and Sligo though, for two reasons: 1) better paths through the City Centre, and 2) post Interconnector/MN, passengers could go Wexford-Drumcondra-Airport or Mullingar-Pearse-Howth/Heuston/Kildare/Drogheda etc. with 1 change in addition what options would otherwise be.
But as Mark said, there would be a lot of issues to correct first.
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