Well, it's not like you're going to throw it away on day 1 when the expansion hits. It'll probably still be useful for a couple of weeks/months until you get a replacement. As a comparisson, people still use ilvl 115 weapons in FCOB, which is 20 ilvl lower than the current cap. Heck, I even cleared FCOB with my alt using a HA blade until I got my Dreadwyrm...