I don't understand why this is so hard for me to explain. SCOTUS did not come out and say "discretionary concealed carry permits are unconstitutional." As a result, RIGHT NOW, MA gun law remains as is.
When the Boston PD licensing officer hands you a restricted LTC-A, if you tell him that is unconstitutional, he'll laugh at you. If you appeal it, the MA judge probably won't laugh at your lawyer, but he probably won't offer any relief, either.
Have the Heller and MacDonald decisions laid the groundwork that may someday bring down discretionary concealed carry permits? Maybe, but we're nowhere near that yet.
RIGHT NOW, discretionary concealed carry licensing remains in effect in MA and in other states (e.g., NY) as well. Might future appellate court decisions change that? Sure, but don't hold your breath -- we've got a long road to get there.