The general consensus in an older speculation thread on how this will work is that we'll still keep our cross class skills and role skills will be something else.

For example, PLD will still keep MRD and CNJ as cross class skills, but provoke (as a necessary skill for all tanks) will be made a role skill.

So BRD will keep PUG and LNC cross classes. At worst you'll lose access to invigorate which is likely going to be a melee role skill. But again maybe not. It's all speculation until we get some concrete info.

But I do agree giving ranged classes the Mage role skills seems stupid, what use do MCH and BRD have for swiftcast? (Only one I can think would be a Mage role skill).