Fayyad is trusted by the donor nations, so his control over money will keep donations flowing in. The idea of appointing a government of technocrats until the elections is a good one. And Fayyad is indeed an economist, and non-political. He is not even a member of Fatah.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: Fayyad to Haaretz: I will not lead a Palestinian unity government