That will be less likely to be approved. People actually care about seeing that funded.
Given the margin at UNESCO, even if a few states defect, chances are, if they ask for it, they will be admitted into any UN organization, where decisions are to be taken by simple majority.
BTW, Mexican abstension is extremely controversial down here - Mexican Senate is raising huge stink about it. There is no way Mexico is voting against Palestinian membership of anything - even to stick w/ abstension is not going to be very simple.