I'm obviously in no position to argue, but in other threads the pipeline has been brought up as a "no build zone". Looking at an aerial, it appears (other than walk/roadways) BGW has opted to shy away from "additional coordination"-such as special supports for LNM were designed to span it. The only things I see built in the pipeline right-of-way are in Scotland.
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Regardless, I agree there's a lot of room. How they use it is dependant upon what they think the market will bear. It would make no financial sense to undergo a massive expansion if they don't see a strong ROI.