I definitely agree that it would have made more sense to include the full corridor to Long Beach in Measure M. It's a key failing of M that it doesn't extend the corridor as defined in Measure R at all. Not one extra stop.
Metro has indicated on several occasions that they intend to run both Green and Crenshaw Line trains on the Harbor Sub, although lately Steve Hymon has been saying that's not yet set in stone. Interlining is a bad plan here (mostly because of where the branch point is), and they should keep the lines separate until the time comes to extend the Green Line north on Lincoln. But the connection will be in place, via the Crenshaw Line, to do exactly what you're talking about using the northern part of the Harbor Sub.
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