Lynch doesn't even sit on the relevant committees for transportation funding, so he's not in a position to "kill" it...he's just being a general-purpose sourpuss to a hot mic, as is his wont. Now...the fact that few local pols have even been able to articulate NSRL's benefits in non- ham-fisted fashion over the last 2 decades is a much larger structural problem. But Lynch (age 69) won't be around in office too many years longer to hold things back when we finally get our act together.
I hear ya, but 69 ain't the end these days for established congressmen - - Lynch isn't getting primaried anytime in the next decade and a half. He'll be there. And, yes, while he doesn't have the committees position, at this point he's probably the most important Southie pol regarding federal dollars - - and particularly the ONLY Boston pol who could conceivably get some of the ear of this incoming administration. I can't see another Boston pol taking him on at this point to turn the tide on that subject. Him saying "no" buries it for now.
And yes, the current local pols really haven't been even partly adequate communicators regarding the import and long-term potential benefits of the NSRL. Throw in the public's ptsd from the Big Dig (the best long-term development since the Back Bay infill) and I share the pessimism of NSRL ever getting done in our lifetimes.