The same dynamics caused the onevoice concerts to fall apart but from the opposite side- the Palestinians felt the organization was a mouth piece for Israelis and didn't include the Palestinian view of the conflict. They even reacted to the idea that they would have to sign a mandate of an organization they felt was against them. I think the writer has it right- the argument is no longer exactly between Israelis and Palestinians but how you view the conflict and what solution you would accept- two state or one state.
Italian FM arrives in Iran to promote economic, political ties (Reuters)
from the article: Planned Madrid peace gathering collapses before even taking off