Until downtime we have 4 out of 4 classes that can Mercy Stroke. Changing that to 3 out of 3 tanks that can Mercy Stroke and 3 out of 3 DPS that can Assassinate feels balanced to me. There's even the option of keeping Monk/Dragoon access to MRD cross class abilities while also giving them ROG. PLD/WAR would be able to gain DRK abilities while the casters can get something from "The Man with the Golden Gun" class from Yoshi-P shirt at London Fanfest. That also allows Assassinate to refrain from being cross class.

I guess I really hate marauder cross class skills.