You really should be getting all the protein you need from your diet. If you're protein-deficient, you're likely a starving kid in Africa. First world people do not need to supplement with protein.
On the exercise front, most people attribute protein to their gains when in fact, they usually just start taking protein when they start working out or working out with an actual training plan or purpose.
High protein diets wreak havoc on your body in the long term. Cancer, kidney issues and a host of other long-term issues.
I'll see if I can find some medically-cited papers on the subject, but here's a few things that popped up on Google searches:
http://www.livescience.com/8086-prot...body-work.html
http://healthyeating.sfgate.com/heal...ents-6597.html
Anyways, just my advice. I bet you won't see a decrease in anything but the drain out of your wallet if you were to cut out protein supplementation