New ISPs will have to, from day one and on top of all other laws and regulations they need to follow, comply, and be able to demonstrate compliance, with net neutrality.

People with more of a network background will please chip in whether this is easy?

Also, more speculatory:

Free-you're-the-product services are dominant in large swaths of the internet. Free-and-you-don't-pay-for-the-bits-you're-still-the-product could be up-and-coming, but Net Neutrality regulation would kill it off as obviously evil. Who knows, it could be an essential stepping stone towards people being paid for all the data they feed tech companies. Maybe Net Neutrality will lock in free-you're-the-product indefinitely.