The Big 4 Middle East/Gulf airlines (Emirates, Etihad, Qatar, Turkish) have been giving legacy US carriers a lot of grief lately, since they're both cheaper and better on essentially all counts, so I can't help but wonder if they have their finger in the pie here. Few businessmen will opt to fly long-haul if they can't use their laptops, and they're specifically targeting 9 airlines here, not just airports or countries.
It's also beyond bizarre that the US trusts Abu Dhabi's security enough to locate its only Middle Eastern Customs/Immigration preclearance facility, but not enough to let passengers who have gone through security bring tablets...