From top to bottom, in descending order of severity.
1) Different narratives that are sometimes conflicting.
2) Lack of hope among the general public on both sides.
3) Lack of trust on both sides.
4) Continued Palestinian rejectionism of the negotiation process.
5) An international, (and Israeli) peace movement that is more of a cult of Israel bashing, rather than any actual peace advocacy, or peace making.
6) An array of “neutral” ngo’s that are in-fact an extreme expression of the former.
7) Anti-Israel biases within the global media that makes it clear to everyday Israelis why peace should not be trusted. Also, an expression of 5.
8) The UN.
9) A hopelessly divided Palestinian leadership.
10) Chronically unstable Israeli governments. This is due to Israel’s current system of government.
11) The settlements.
What defines severity here is the ability to change/remove these obstacles.
Settlements had been removed before; and therefore, can be removed again. The question is what Israel gets in return.
Israel’s political system can change. It requires public support. The need to change it, is mainly due to internal reasons; unstable coalitions, and extortion power to smaller political parties. Changing it requires public support. When it comes to the peace process these weaknesses can be bypassed. But not always successfully.
The Palestinian leadership can unite. If the leadership will it. Since their motivation for maintaining the division is that of personal gains that is less likely. And if they do unite, will that be behind an extremist message, a practical one, or a moderate one?
The UN will change if global politics change. Right now, it is another battlefield.
I don’t know what can change 5,6, and 7. But if they can, they can help alleviate, 3, 2, and 1. In that order. They will help the process; the process will do most of the work. The process will create trust in the process itself. This will serve at first as substitute to the lack of mutual trust. As the trust in the process increases, it will lead to some degree of mutual trust. As this is increased, hope will be rekindled. As hope, and trust increases, they will energize the dialogue. Opening the way for a dialogue of narratives, the hardest part of the process. Where it can all fall apart again.For the process to restart, the Palestinian leadership must attend the process, change 4. The longer they procrastinating the less we have a motive to resume it from our side.