You need to be careful with the "law changed quick" stuff. Once you open the can, the legislature can toss in all sorts of NY style stuff. Fortunately, MA does not have a NY style tradition of taking "emergency measures" to pass anti-gun laws without debate or feedback. GOAL will no doubt be working carefully with the legislature to avoid damage to the extent possible.
For example, last I checked only 8% of LTCs were restricted. Unlike NYC and NJ, there is not going to be a huge flood of hundreds of thousands of new gun owners carrying, and if the legislature understands this, will be less likely to engage in knee jerk, feel good, accomplish nothing reactions.
This must be pursued in a careful, well though out manner in order to avoid unintended consequences.