There was a rumor that the FAA was putting pressure on the company to improve the 767 experience level thru hiring. Another rumor was AMC wanted more experience in the cockpits.

This is not a knock on the folks that are on the 767. Almost all the 76 Captains are new to the plane and there's a good chance that any future upgrades would be 744 FO's, again with no or little 76 experience.