Metro will be a game changer but should also reviewed alongside the other projects that have been progressed at the same time.
DART+ will provide transformative connections to the metro, Heuston side of the network, the option of changing at Hazelhatch/Heuston for a DART to Glasnevin to connect with the metro, or luas/bus on to the city center to connect with the metro. On the Sligo line, changing at Maynooth for a DART to Glasnevin will bring you into the metro system. Northern and South Eastern line has connections at Tara Street. Also would not be surprised to see an extension to connect to the Northern line and unlock land development north of Swords announced around the time construction is nearing completion.
Also it should not be viewed as a city center to airport connection, the town of Swords suffers from terrible public transport connectivity and a reliable consistent journey time will be transformative. NTA has found that there can be up to over 60 mins of a journey time variance of buses from Swords into town due to traffic congestion.
It is one of the most congested corridors at the moment, its not surprising looking at the trip generators served by the alignment. The capacity the metro can bring is amazing, its around 20,000 people per hour per direction, the luas is roughly around ~8,000 in comparison while a bus on a bus corridor on a 15 min frequency tops out at around 3,000 people per hour per direction.