JeffDowntown
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The tunnels beneath most of the Plaza were built in the mid-1960's: namely the northbound Green Line tunnel and the loop tunnel. The only tunnels that are 1910 or so vintage are the ones running right alongside the east side of Cambridge Street and the southbound Green Line tunnel (running where Hanover Street once was).
So, the point being that most of the tunnels are relatively new and shouldn't require much, if any, structural work. The old tunnels might, but no more than all the other old Green Line tunnels that run down Tremont Street and under Boston Common.
If the City were to ever launch a serious redevelopment of City Hall Plaza with new buildings and additional streets, the tunnels would not be a problem. Just slap on a 3 foot grade raise over the tunnel roofs and the entire Plaza area to provide cover and reinforcement for new development.
I think your assessment is a little simplistic.
The T is not known for "unbuilding" old tunnels they abandon. While some of the tunnel network was rebuilt during the 1960's urban renewal, I believe that the abandoned shells of the old Adams and Court stations, for example, were left down there. And none of the abandoned tunnel works get any maintenance.
Also, given the standard corrupt construction practices in Boston, what makes you think that tunnels built in the 1960's are in good shape. We have infrastructure from the 70's and 80's that are crumbling due to use of under-spec concrete.