Since it will be the PLO who will be declaring their state then it is THEY who will be "elevating the status of armistice lines to that of being international borders", not the UNSC. All the UNSC will be doing is saying "OK, we recognize that YOU have the authority to make that declaration". Which, indeed, the PLO does, because such a declaration will actually see them formally CEDING over 50% of the territory that properly is their's to Israel, and an Israeli refusal to recognize that will actually put everything between the Green Line and the Partition Line back into play.....
UN agency warns school may be delayed for Palestinian refugees due to lack of funding (AP)
from the article: PA official: Arab states to attempt UN-forced settlement freeze