I agree the content providers will benefit. Not sure about ISP's. Yes, they do get monopolies of a sort, but they are restricted from charging more based on bandwidth use. You think Comcast likes that? In the end it does mean higher rates and less innovation for the rest of us.
Of course Comcast likes it. Why? Because, after it's squeezed all real competition out through the imposition of regulatory barriers to entry - there will, perhaps, be one pro-forma "competitor" in each market - it will be able to get rates set to by and large extract its expected ROI because it's the only game in town and, well, Mr. Regulator, if you don't give us the rates we need, why then, we'll just have to shut down (and take our networks with us).
Look at the way it works with rent control in NYC. Rent control hasn't gotten rid of the big landlords, it's filtered the crowd so that you end up with the worst of the lot of the big landlords running most buildings, and a small bevy of little landlords who respond by simply not doing anything but the most minimal of repairs to their buildings. The big landlords like it that way because they don't have to compete on service and can be quite nasty when it comes to dealing with tenants (I know, I used to rent from one of the biggest). And they still manage to squeeze their ROI out of the buildings. And the only new buildings that get built are high(er) end luxury apartment buildings - and condos and coops.
Look at how it works in insurance as well. Obastardcare is a good example. Remember how Obastardcare was going to bend the cost curve down? Did it? No. Even though health insurance companies are so heavily regulated they really are nothing more than public utilities - a common theme, apparently - and must ask permission from their regulators for premium increases, nonetheless, they have still managed to raise premiums at an accelerating pace. And Obastardcare has also squeezed out competition so that in most markets there are at most one or two pro-forma competitors.
Public utility regulation creates a quasi-monopoly, or an oligopoly, in which a few large, politically-connected firms control the market and set quasi-monopoly prices through a combination of their market control and regulatory capture of the regulators.