You can't kill the old terminology when it's so much easier to remember and say!
Plus, the whole "recruitment" process makes it sound like we're the military or a sports team or something.
I don't quite get the movement towards shorter pledge periods, either. There's a lot of stuff to learn about in those "new member education" sessions and it's a lot easier to get it all down if you have more time (and can spread out pledging activities over a span of time to allow time for, I don't know...school? sleep? eating?).
All the PC-ness seems really silly to me since our campus (and most now) are really strict on what Greeks can and can't get away with to begin with. Even if we wanted to, we couldn't pull all the "Animal House"-style antics and stay on campus for more than 2.5 seconds afterwards. It gets called rush, pledging, etc., because it's easier to say, girls from Greek families grew up knowing the old terms, and few people I know really associate those words with anything negative.
Besides, my pledge period was mostly getting pampered...oh, and getting to wear the awesome green and white ribbon pins (that weren't required of us as pledges, but "encouraged"...haha, wow). But am I the only one nowadays that associates "pledge" = presents?