Please, don't try to balance WvW if you don't really know how. None of these changes have the potential to change the meta for the better, these are just some nerfs that'll make playing the classes feel less rewarding. The Guardian/Firebrand for example has always been, and even after these changes will still be the pillar of each group, since we need a reliable source of stability. Provide an alternative, give another class a rework, look at skills that have been worthless for a long time and change these for the better. Don't rather randomly nerf classes. Listen to experienced WvW players, please.