Being from New York I have read and seen so much on this issue today it is kind of ridiculous.
I think that the 7 round mags are the least of our problems. New York is now going to track these weapons such that anyone that owns an AR or whatever has to have it registered. Furthermore, ammunition will be electronically tracked. When you look at this now you might say, big whoop, just one more hoop to jump through and bam you have a gun. However, long term, now authorities know exactly who has what and where to find them so when shit hits the fan disarming New York is easy.
Sucks that I just bought a house here otherwise I'd consider moving.