I don't think they'll keep the Proshell trait. If the point of the change is for balancing then the baseline protection should be equivalent for all jobs. I guess we'll find out more when they announce the exact change they're making.

With that being said, I hope they do remove the Proshell trait and give replace with a Cleric's Stance trait that gives a 20% boost to damage instead of 10% =D Or maybe damage done by the White Mage using single target abilities restore 5% of the damage done to the target's target.

*Dreams*