Said it before, saying it again. Leave Green Line as is except expanded to 50m trams, keep the TBM heading south from SSG into Terenure/Templeogue and down to Tallaght. No worries about compatibility, no shutdown of the Green Line to connect it to Metro North, no waste of money on Line BX.
Dig out the tunnel and rough in the stations and then add stations progressively south as funds permit.
Yes, it will cost squillions but it adds a quantum increase in capacity in an area of the city choked by buses, and gives an alternative to Green Line in terms of catchment management in the inner City. It is a reverse of the usual method of Irish transit planning - accept a minority level of transit usage and build capacity behind what little demand there is.
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