There is one major flaw to this otherwise great idea. There is no middle ground between server and instance, so I'm assuming your class would automatically, and forcibly, changed before you enter the instance, considering all qued members have already selected commence. There are quite a few obstacles that the programming team would encounter trying to implement such a thing. Would the class be forcibly changed during combat? If so, does the mobs attacking you dump enmity, or are you going to receive a bit of damage in that split second while the system switches your gearset and ports you into the instance? If the mobs do dump enmity, could this feature be exploited? This is important, especially if you are switching from a high-level to low-level.