Be serious. That thing is a total sham. Look who is in it - all the big states that normally vote the same anyway. Since it is practically impossible to win the popular vote without winning those states they have nothing to lose by being in this 'compact'. But, just in case, they stick in that little 'but only if enough other states do it' clause, which they know will never happen (because the other states DO have everything to lose).
If you think NY would EVER convert votes for democrats into votes for republicans just because other states did, I'll have some of what you are smoking. If that were to ever actually happen the legislature and governor would be replaced so fast it would make your head spin, and that would be the end of the 'compact'.