The commuter rail ridership is roughly back to pre-covid levels and the highways are similarly packed with stop and go traffic.
Certainly doesn't seem like it given the funding problems. I think it would work as a Inner Core subway relief valve but sure also seems like the Pols don't have that vision.
Time is definately a big problem too. How long you'd think it'd take? Pretty much every Pol will be long gone by the time it would be finished.