The Palestinians are screwed. But they have to take some responsibility for this. For whatever reason, they have always refused to develop an effective government that will speak for the Palestinian's benefit. They have always played the victim, relying on fellow Arab states to fight for their rights. This passive aggressive approach caused them to not act when offered good peace plans (Clinton plan, Oslo, and etc.). This approach seemed to work for a short time as the Arab states made peace with Israel contingent upon finding a good solution with the Palestinians. However, time is not on the Palestinian side. And as time has gone on and on: the Arab states have recognized that they have more immediate concerns: countering Iran; the wars in Yemen, Libya and Syria; and economics, diversifying their economy, and stability.
The Palestinians are weakened by their internal divisions, lack of strategy, and leadership made unpopular via bad governance and corruption. They mostly say just say "no". Just saying no isn't going to get them anything. And their allies, the Arab states, have moved on. Palestinians are no longer their priority. I'm still optimistic for the Palestinians. But they are going to have to start looking out for their own, rather than rely on allies or the UN to save them.