There must be other reasons for the PM to resign than the move to go to the UN. Going to the UN gave at least a recognition which Israel has so far put on the backburner. With or without Fayad, the Palestinians need and have a right to self-determination. As long as Palestine is under occupation and cannot independently develop her economy, the international community has to support the PA.
Palestinians report IDF airstrikes on Islamic Jihad targets in southern Gaza Strip (Haaretz)
from the article: Fayyad's resignation: The beginning of the end of the PA?