There's always limits on freedom due to conflicts, eg the classic conflict between my waving my fist and your right not to get punched.
Sure. Now please explain, how this truism is relevant to the issue at hand. Whose "nose" and whose "fist" are we talking about?
Staying on topic, there is limits to how many Individuals can erect telephone poles and how many wires/fibers can go on the poles
There may be a limit, but we are far from reaching it. FiOS cable runs to my house from the same pole, from which Comcast's cable runs to my neighbors. I think, the same pole can handle 10 or 20 more such cables easily.
the collective can put up the poles, run the fiber and allow anyone to use them for a reasonable fee
You must be a real fan of our collectively-run roads ($2mln per mile!! where I live) and public transit, but I am not. Just what is it, that makes the normally monopoly-abhorring slashdotters all weak in the knees, when it comes to governmental monopoly is beyond me. It is the worst monopoly imaginable...
there's also a limit on the number of roads that are possible so they're run by the collective
First of all, I do not accept the "cables are like roads" analogy — they aren't. But even roads can be private and competing. If Tokyo has privately-owned competing subway lines, why can't New York?