Will WHM be getting a new trait to replace ProShell?

[Lyrica_Ashtine]

The whole point of making everyone get proshell is precisely so you aren't forced to run a WHM for buffs - why would they make it so that WHM get something to just make it stronger, again?

Well, you're in the wrong here. You're not forced to bring a White Mage. It just makes healing easier/mistakes more forgivable. Much like how no group is forced to bring a monk for FCOB Turn 4, it does make healing easier/forgivable. You could in fact do the very same turn without a scholar, like how it can be done without a white mage. But having either presence just makes it easier. Same applies to:
Bringing...
...bards
...monks
...warriors
...casters
...scholars/summoners for virus
...ranged classes in general*

But there are some problems with Square-Enix's logic that it's for "balance". I'm not saying it's wrong, but merely incomplete.

* No sane group would bring 4 melees (6 with tanks) to, for example, BCOB T5 or FCOB T1. But it's doable, however.