There is plenty of evidence that regulation is required. Even before yesterday there is a laundry list of violations. Verizon has even explicitly stated in court that the neutrality rules are what is preventing their plans to block websites that don't pay their tolls.

http://www.nbcnews.com/id/21376597/ns/technology_and_science...

https://www.cnet.com/news/telco-agrees-to-stop-blocking-voip...

https://www.lexology.com/library/detail.aspx?g=a679f360-9890...

https://www.wired.com/2009/10/iphone-att-skype/

http://money.cnn.com/2011/12/06/technology/verizon_blocks_go...

https://www.wired.com/2011/06/verizon-tethering-fcc/

http://money.cnn.com/2012/08/23/technology/att-facetime/inde...

https://www.savetheinternet.com/blog/2013/09/18/verizons-pla...