I think the idea is that this would be a one-way street. That once you start relying on ad sales, all future decisions would be colored by that reality. Since t

I think the idea is that this would be a one-way street. That once you start relying on ad sales, all future decisions would be colored by that reality. Since the impact of the ad(s) would be great, the effect on the evolution of Wikipedia would likely also be significant.