"In any event, why is everyone suddenly consuming so many magazines? They ought to last a lifetime."
It is simple. Although NY law doesn't grandfather the great bulk of laws passed do grandfather.
If you were on the fence about anything, higher cap mags, an AR, or for that matter your first gun purchase, etc, it is a perfectly rational behavior to buy now even at a premium.
I give the odds of new federal level hardware based controls a low probability, I think, this time, they will be held to broader checks. But actual new controls on mags and types of weapons are not a nil probability. Also additional hardware oriented controls are extremely likely at the state level in several states.