As a support enthusiast, I would like there to be games where I hit full build.
Perhaps there is an elo where this happens, but I am not in it. As far as I can tell, it doesn't get better the higher you go, either. Even professional supports don't hit full build.
That being said, lowering the price of support items is not the answer. That would be an unnecessary buff to both supports, and by proxy, ADCs. I would simply like games to occasionally last long enough to result in everyone hitting peak power.
I'm not exactly sure how to accomplish this, either, but maybe we can think up solutions in the comments.