AHHHHHHHHHHHHHHH the sky is falling!!!!!!!!!!!
I can't count how many time's I've heard this over the years.
There's a couple of ways to counter the GK's you'll find a way. DE player's are going to be putting cruicible's of malediction on everyone, WH players will be using the power that neuter's psykers or psykout warheads, DA will just use there old school psychic hood, IG will pistol whip the SOB's, etc, etc .....