Sure! I don't want to dwell on the same 3 classes for next 2-3 years. It would bore me to dead. Put new element like nature with green color for healing and dealing venom damage, New 1 or 2 classes, new sub classes and finally re-balancing and divided classes into defined roles like healer or tank, nowadays it just slight differences for each class. The defined roles/classes would benefit the complex of the raid in term of teamwork and how people select classes for playing raid.