With the upcoming changes for Cataclysm, in regards to raiding lockout and rewards, nam has decided to go for 10 man raid size. In order to prepare for that several members were removed, not something done lightly. The primary reason is that there are 15 less spots and the Officers felt this would give people time to organize before Cataclysm.
Most of them are good players who would be a great addition to any guild or raid.