Airline charges for aisle seats

I'm surprised it took this long, but the first US-based airline is now charging extra for emergency-exit row and aisle seats. According to a Reuters article, Northwest's "Coach Choice" will save some of those seats for sale to passengers as $15 upgrades at check-in. I always thought that middle seats should cost a few bucks less. I'm sure that will eventually be the case, only because along with the aisle surcharge the airlines will probably start demanding a premium for a window seat "view." Meanwhile, American Eagle announced that they'll stop charging for soft drinks because nobody was buying. Link (Thanks, Jason Tester!)

UPDATE: I'm aware that some airlines, including Virgin, already charge extra for emergency exit rows.