Actually, out of six people I know from either when I served or friends I've met locally, four have been called up because of 9/11, and all four are leaving, and one that wasn't called up is leaving. The other one is about to hit 30 years with active and NG duty and is going to stick it out.
I thought they'd be leaving because it is getting silly, but you know what?They are leaving because they are working side by side with civilians doing the same jobs at the airports and what-not, and getting paid less. They see no point in doing civilian jobs for less pay, and it has hurt them financially. A couple also mentioned they felt uncomfortable with some things they have had to do (I'm assuming the searches, they are quite conservative).
GW is going to gut the NG at this rate, although it's partially Clinton's fault for making so many cuts, and partially the Army for restructing their divisions around NG/Reserve units.