When you lower the incentive for something, you get less of it. The amount that you currently have is likely to stay, due to sunk costs and the difficulty of converting resources, but you don’t get new ones.
When an item is nerfed, you stop camping for it. When a quest is nerfed, you stop running it. When a dungeon is nerfed, you stop going there. At least, you stop doing so as much. Same risk, lower reward.
When you discuss net neutrality, you are talking about maintaining current prices in return for less bandwidth being created in the future. You are lowering the possible rewards to bandwidth providers while creating the threat of taking further control of their property away in the future. Also, while you are lowering the incentive to conduct maintenance, you are increasing the incentive to shift funds to lobbying; if the government will determine how (and how much) they can charge, the company will make its money by directing its attention to the government, rather than you.