The latest attempt has a slightly better chance though - because Hamas has been rocked by the Egyptian coup, losing its main monetary sponsor and partner.
Hamas and Fatah will hold meetings to discuss the implementation of a national reconciliation agreement on Sunday evening and Monday morning, members of both movements told Ma'an.Hamas is hurting for cash, and Fatah may be its best hope to stay afloat.
Fatah official Nabil Shaath and Hamas official Khalil al-Hayya said they considered reconciliation a top priority, and that an earlier meeting between a Fatah delegation and Gaza Prime Minister Ismail Haniyeh was a success.
"We realize that the road to freedom and independence is still a long one and needs a lot of work, and the first step is Palestinian unity," Shaath said.
"There cannot be a state without Gaza," he said.
Shaath also praised Hamas' recent decision to allow Fatah lawmakers to return to Gaza.
Al-Hayya echoed Shaath's statements.
"We at Hamas want to be united with Fatah and not interfere in Fatah internal issues," he said.
Al-Hayya said Hamas had sent a letter to President Mahmoud Abbas, saying "that we support him in his position of protecting our principles."
If the Fatah-led PA would take over the Rafah crossing, for example, then Hamas-hating Egypt would probably keep it open more. Exports from Gazs could increase if Israel could deal with the PA directly on those issues.
When the current negotiations between Israel and the PA collapse, Hamas would have one less reason to avoid unity, because one of its conditions has been to stop negotiating with Israel and continue based on jihad.
And when it comes down to it, Fatah and Hamss are not that far apart ideologically, as much as Western media and pundits like to pretend they are. They both explicitly support terrorism and both agree that terror is not in their best interests at this time. Islamic Jihad and other terror groups are convenient to use for today's attacks, and both Fatah and Hamas can claim that they are innocent.
While it is still a longshot, this time there may actually be a chance for some sort of quasi-unity between the two. It would necessarily involve the PA moving away from a peace posture, but the West would provide cover for them since so much of the media and Western governments and NGOs have been so invested in the lie of Fatah "moderation" for so long.