While I'm not a fan of this really, we have had text since the first MMO's giving us the same warning and often times it was faster/more efficient than the animation anyways. I'm sure you can still look for the casting animation and it might be faster that way, however since there was almost always a text prompt in the log you can't say it is the end of the world.

I just hope it doesn't look too tacky in practice and is not overused.