Nope, quite the opposite on the realm I am on.
Have you not gotten connected to other realms yet?
That one change alone single-handedly saved the game and our realm for us, and I have never been more excited for an expansion knowing the amount of people I will see again!
That being said, if any 25 man guild is going to 10 NOW, they are confused. There is absolutely no reason to be doing 10 man now, and I would encourage any raiding group to begin preparing for mythic.
Most 10 man groups don't understand how much planning and vocal leadership is required to keep 20+ people focused so if you want to stay relevant when the patch drops, its best to prepare now.
All the gear will be replaced when leveling, so unless you are 10-12 bosses deep, its time to just start recruiting or discussing mergers.