Boston doesn't need

another convention center.

The ones we have, are already under utilized, there is a recession going on out there, travel costs are up budgets are tight for conventions etc.
We do not need it.
Instead of wasting time and resources on larger venues that would compete with a shrinking event dollar, lets take all the time, effort, talent & money and put it towards something really useful, like a North South Rail Link.
It'll provide jobs and stimulus locally during the current hard times and prove a sound investment when prosperity returns.
In the great depression, FDR didn't built hotels and convention centers that stood empty waiting for free spending ways to come back, no he built the TVA, dams, put up power lines, laid down roads all things that were sound investments when the good times came back.
Trust me if this was 1935, they'd already have broken ground on the sumbitch, its a no-brainer.