I don't think the "internet = electricity" analogies are very good. The regulated part of the electric monopoly (e.g. ComEd in Illinois) just has to maintain wires built decades ago. If internet infrastructure were the sort of thing we could bury in the ground for 50 years and forget about, that might work. But stuff that was state of the art in the 1990's is obsolete now. There is no public infrastructure that turns over that fast.
You didn't respond to my point about politicizing investment decisions. Utility investment decisions are intensely political, and voters don't care about better technology, they just want cheap rates. Its a huge battle for most utilities to raise the money they need to upgrade the network, or even just maintain it properly. If you think Comcast is slow to upgrade its network, what do you make of utility companies that are operating coal plants that are literally a century old? The fact that public utility regulation has left us $3.6 trillion underfunded is totally ignored by proponents of municipal internet service.
Electric utilities cover large areas. You use Excelon as an example, who delivers my power in Northern Illinois. As you say "..[they] just has to maintain wires built decades ago." It's not just wires. Its transmission facilities all the way from 700kVa down to the 120V step down in your neighborhood, even to your service entrance.
Internet access is no different. You trench fiber in the ground, you drop equipment cabinets on the curb, and you pull your plant to your CO for interconnection to your routing/switching gear (although sometimes this gear is distributed across the plant instead of at the CO; depends on size/network topology).
My municipality or coop not upgrading fast enough or providing the service I want? I argue I have more leverage in that case as a share/stakeholder. With Comcast, they're out for the shareholder, not me.
As I've said elsewhere, almost all other utilities have functioned well in a regulatory, profit-restricted environment. Why not last-mile packet delivery?
As for utilities having functioned well: you keep ignoring the $3.6 trillion U.S. Society of Civil Engineers number.
Not only do I believe I have a better shot as a voter, I believe I'll have more control over the service I receive.
http://bgr.com/2014/05/20/comcast-twc-customer-satisfaction-...
"In fact, Comcast and TWC’s Internet service businesses were the only two businesses in the United States to score below a 60 on the ACSI’s 100-point scale. What’s most amazing is that both Comcast and TWC have even lower customer satisfaction ratings than United Airlines, which has a notoriously bad reputation in an industry that, due in part to government security requirements, is known for delivering a miserable experience."
Again, the proof is in the pudding. We have underinvested in our infrastructure to the tune of $3.6 trillion. Our bridges are crumbling, our transit systems haven't been expanded in decades, our sewer systems are polluting the environment because nobody wants to spend the money to bring them in compliance with environmental laws, and yet you posit that public utilities work "very well" and assert that they should get involved in an area where technology moves 10x as fast as the areas in which they already lag behind. I just don't see how you get from point A to point B here.
Let's not forget the big elephant in the room too. The states haee no money. When Illinois is deciding between defaulting on its debt and giving a haircut to public employee pensions, where do you think spending money keeping up with telecom infrastructure upgrades is going to fall in the list of priorities?
Correct me if I'm wrong, but Comcast's profitability is over $1 billion a year.
Should my electric company be able to profit at that level? Because they're much more reliable than Comcast, and they're a regulated monopoly that needs to report to the PUC (Public Utilities Commission).
Have we determined yet if Internet access is a utility such as phone service, electricity, water, and natural gas service? If it is, isn't it time last-mile delivery is regulated as such? (Which leaves Comcast in a precarious position as a last-mile provider)
Also, I'm not unhappy with Comcast because of my service. I'm unhappy because of their efforts to prevent municipal broadband. They are the Koch Brothers of the Internet, and are attempting to squeeze whomever they can for access only they provide in a great deal of markets to a tool that is the foundation of the 21st century.
TL;DR Regulate last mile delivery as a utility, politely ask rent-seekers like Comcast to leave.