Personally, I prefer the cheezit flavored airplane shaped goldfish that Alaska sometimes has.
It's funny, the money saved by pretzels is consumed per flight in like 5 seconds of the engines running. If they were really serious about cost cutting, they'd actively work to change procedures to minimize the time on the ground with the engines going. IMHO. Or, for that matter, just plain minimize time on the ground.
Of course, maybe they are, and this just happens to be one of the tiny things they're doing that got some reporters attention.
I'd guess that boarding/deboarding could be significantly sped up if they utilized both the front and rear exits. Even if the rear exit went to a portable staircase, the amount of grumbling by people who have to climb stairs would be offset by satisfaction with not having to wait as long in the stuffy cabin.
...and if the airport HAS another jetway available, even THAT's not a problem.