This is my saving thought as well. If we see anything nerfed, it will be the 4pc, since a ~2sec ShotR is going to be REALLY hard to manage properly for all but the top 10% of players, esp so with uptimes of only 60-75% (without 4pc), which will become 40-50% if that was the change. Or, further reduction of the power of ShotR would bring it down to like, what, 15% reduction? At that point, most of the lower quartiles of players will not even see it as worth casting.
So, thank those nubs and hug the LFR-Heroes, ShotR should be safe!
What is more likely would be something catastrophicly lame, like "Casting Word of Glory now refunds 1 Holy Power. Period." But then, I'd not feel bad about ignoring tier (again), so it's not all bad news.