While I haven't read the FCC's version of net neutrality, The Netherlands has had net neutrality for several years. In the meaning that an ISP cannot prioritize traffic, or block traffic, or pay for (faster) access to a specific service. With very few exceptions. You can let people pay for faster speed and download caps are allowed.
This has not caused any problems, at all. Internet access is still fast and affordable. fiber/cable/dsl do not have usage caps. ISPs have not gone bankrupt.