Umm, since before the Air Force was an independent service.
There's a whole lotta butthurtness on this forum over something they really need not to be butthurt over. There was no 1500 hr rule in the late 90s, yet folks had no problem getting hired then. If the airlines keep hiring at the levels they're projecting, you're worth your salt, you'll have no problem getting hired--even if they rescind the 1500 rule.
For Goldfein, the issue is that the 1500 hr rule screwed over Air Force pilot retention even more. At least before, there was a marginally financially viable way for folks to build their hours through the civilian-only route. Folks would take the financial risk of paying for all the training and quals, and would suck up flying for peanuts in the regionals, since they had the hope of eventually reaching the big leagues, with their big league pay. The 1500 hr rule screwed that whole path up. Once the pool of maybe 3,000 (I get this number from a previous poster--can't vouch for its accuracy) well-qualified folks dries up, where are the major airlines, regionals, business aviation companies, etc., going to find their pilots, other than the military services--most notably Air Force, but also Navy, Marine Corps and Army? Rescinding the 1500 hr rule would at least offer a little bit of relief, and at this point, every little bit helps.
Goldfein faces a further problem, in that a surprising amount of the military mission is executed by civilian contractors. The 1500 hr rule thus not only makes AF pilot retention harder, but it threatens the national aviation industry, by raising the barriers to entry too high for pilots. USTRANSCOM, for instance, contracts a helluva a lot of cargo movement; what happens when Atlas, Kalitta, DHL, etc., can't fly due to aircrew unavailability? It's not like they'll be able to task more C-17s to meet mission requirements, since--you guessed it--the AD and ARC C-17 units will have been gutted by airline hiring.
In my mind, it would help if Goldfein approached the problem as a threat to the national aerospace system and industry, than "simply" a pilot retention problem.
TT