Assuming there are 20 slots each way per hour on the Northern line as well as the Interconnector, each Intercity/outer commuter train would probably get two slots (sticking them behind Howth trains to give them an extra cushion). If we assume one Intercity and two commuter trains per hour, that still leaves 14 slots for DARTs.
I'd like to see 3 or 4 tracking at least as far as Howth Junction, and preferably further. From the amount of development that seems to have been allowed to take place close to the tracks, it looks doubtful that IE have any ambition in this direction. For example, recent developments just south of Howth Junction, and beside the northbound platform at Malahide.
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