FWIW, New York's ban is clear: It has to be manufactured as a 7 round mag (or less). They are not allowed to pin mags. To satisfy that market, and possibly the other 7 Democrat states who have copied the NY State bill and are trying to pass it, Magpul may well start making 7 round Pmags that are solid plastic on the bottom end - who knows?
If Obama gets his way, all new mag manufacture will be 10 rounds or less which might make magazine imports form the US easier for us - who knows?
As for P-mag shortages, if the ban goes through and is not repealed by the courts, New Yorkers will have 365 days to sell their mags out of state - that should create a glut and end the drought. So mark your calendar for January 15th, 2014 and have money ready for those Pmags... lol.
I'll have to tough it out 'till then with my dozen or so windowless Gen 2 PMAGS. Life is hard.