Isreal has a well established history of not honoring treaties so I don't see why Arab countries would be expected to honor their end of the deal.
The Palestinians will probably do the right thing and preserver until the israelis cross yet another red line. Let's just hope - for the israelis sake - that they don't cross a line to far.
No one is going to invade Israel.
Palestinians should sign the last peace deal. They aren't going to get better terms.