It doesnt really matter what they do because most likely workers will be laid off anyways due to less business coming from a state like NY (maybe not now due to current demand).
NY gun shops will probably close because when you lose the selling of firearms like Glocks, SA XD's, S&W MP's, AR's and so on and so forth with any firearm that can hold more than seven rounds and most likely will not ever have a 7rd mag made for them. Even if you got companies to make 7 round magazines for all these, is it worth their while right now to retool when the market for 10-30 rd mags is so hot right now every where else it is legal to own them?
Also, look at the economic impact that a ban on the manufacture of "EBR's" and "assault weapons," will do to the economy as a whole.
There is atleast 100+ makers of firearms with these scary features. What would be the incentive for them to stay open if they are no longer able to manufacture a complete firearm or lower receivers that are no longer to be made? Companies that manufacture and sell accessories for them would be going out of business, gun shops would close because their hottest sellers are no longer able to be sold. The loss in tax revenue to the .gov would be a drop in the bucket but as taxes go and in the real world is a lot of coin.
No 10-11% tax on those complete firearms now not being made, the local sales tax not being paid to the .gov (most places), payroll taxes not paid, corporate taxes not paid, property taxes not being paid, employees on unemployment putting a strain on an already OVERLY STRAINED system.
There are probably a lot more taxes Im missing in this whole rant about it but, someone some where in the .gov has to bring this up before any vote can be taken. Yes the could have done it in NY and said all these things but it was a closed door meeting with only certain people in the room, probably bullied into casting a vote right then and there for no other reason than an agenda to disarm people slowly.
Everything the .gov does leads in one way or another to some kind of economic hardship on someones part and it aint the .gov.