Essential aspects of a subway station to the BERy (?)
* Entrances all up and down the street, for example (Washington St.) Lagrange, Boylston/Essex, Chickering, Temple, Summer/Winter, Frankln, Milk, State, Couple' more examples: Kendall, Arlington, Hynes, and even Gov't Ctr. had two entrances each.
* Fit in the available space (note particularly State St. north and southbound on the Orange Line.
As far as closing down Gov't Ctr. completely, you gotta be kiddin'.
On the other hand, the closure would let us all visualize what the station currently is to someone in a wheelchair. The story was told that early in the life of the Washington DC metro, one station that was otherwise finished was not opened an trains just cruised by it until the elevators were installed a little later.
Build something. Anything.