Honestly I think a better alternative is a flyover near Diamond Creek and then to join CR alignment earlier. The CR would get a grade separation as a nice bonus. It would probably require demolishing ~5-6 houses in Oak Island but I think that's much easier than trying to navigate Point of Pines. If Revere wants a station at Point of Pines they can pay for it.
The flyover of Diamond Creek is probably going to be the
most expensive option out of any because of the tricky EIS'ing. Which is why the state preferred that one the last time it gave a cursory look at the project: tankapalooza potential. You need to do a trestle on pegs over a lot of marshland acres, need to quad up and raise the Eastern Route embankment, and need to do a quad-track bridging over the Oak Island Rd. grade crossing with property takings. With likely no intermediate stops between Wonderland and Lynn contributing
any ridership offsets for all that pain.
Point of Pines has its own problems, of course. But the flood risk is
not more severe on the BRB&L ROW than it is on the Eastern Route ROW. The marsh is actually
much worse for that because of its drainage properties. So that's why the EIS'ing is a blowout on the Diamond Creek ROW and isn't on any other routing. If the state were truly concerned with building this and truly concerned with building it climate-resilient, they
would be looking at Point of Pines and
would not be looking at Diamond Creek instead of putting its finger on the scale in the opposite direction.
Alternatively, there's a third potential routing that avoids all of the Diamond Creek wetlands, the Oak Island Rd. grade crossing, and the Point of Pines encroachment. And that's the "middle alternative" of a BRB&L extension to Oak Island St./Jack Satter House, where the 1945 plan had an intermediate stop, cutting behind the Oak Island Park ballfields and 1A
here at the crane operator yard, and joining the Eastern Route right behind said industrial tenant at about half the distance across the marsh. You get 1 intermediate stop's worth of ridership, fewer land-takings, and explicitly avoid the worst of the cost blowouts. That may end up being a preferred alternative in the end if given serious study.