A semiconductor fab costs several billion dollars. Rollout of a national communications network still costs even more. The world is still full of big lumps of capital that aren't going away any time soon.
Agreed, and I'd be in favor of those being financed at least partly by the government and offered "at cost" because it lowers barriers to entry for new participants. I'd also include drug research, roads, housing in areas without a housing shortage (IE, not SF or Manhattan), and more. I even think the idea of a living wage makes sense and in fact will be necessary, I just haven't figured out how to pay for it (and frankly, the naive implementation of "just give everyone $X" would be so hugely expensive that it strikes me as infeasible. A working implementation is going to need to be significantly more... creative.)
And yet, the big stories of the last decade or two have noted a trend: more value being generated by fewer people with fewer capital expenditures (prime example being MSFT > Google > Facebook > Instagram/Whatsapp/Minecraft). The majority of "capital" in those cases (VC money, if applicable) is spent on engineering salaries.
Meanwhile, oil companies are dying, communication networks are barely profitable (cisco?), and "hard industry" is an industry no one optimizing for profitability wants to get into unless it's to break it up and sell it off. Of course you can point to the recently ended energy bonanza during which Exxon became the most valuable company in the world; explaining the drivers of that is beyond the scope of this comment but it's not about energy being a fundamentally awesome business to be in (but briefly, BRIC growth + monopolistic practices to really juice income).
So the interplay between brain capital, industrial equipment, and various other types of capital is more complex than "the public should own the means of production". Some of it yes, most of it no. And I'd argue the brain capital trend is going to continue while heavy industry jobs are going to keep disappearing, forcing us to resolve the "interplay between capital" question in a way that doesn't collapse our entire economy, doesn't cause a civil war (and/or avoids one), and doesn't end up with the public (or a small group calling themselves "the public") being able to shake down any success story simply because they figured out how to make more money than the next guy.
Apart from the fact that material production is still the real source of material goods, that sounds like an individualist fantasy. The idea of controlling one's own mind is a tautology, and as for the body, who can say where it starts or ends? We are interdependent. Combine those two assertions and I don't think you can draw any lines around individual persons any more.
There is some particularly crazy thinking in philosophy on self-ownership, which may interest you:
Cécile Fabre, Whose body is it anyway? Justice and the integrity of the person
Presumably by studying geology, then thinking a lot about the oil formation process, and working out where to find some before anyone else. Then, you can negotiate to obtain value for your knowledge of the location...
That's a bit of a stretch dude. In our world it's easy to think in terms of intellectual capital, but look around you - every object you see was manufactured somewhere.
The knowledge economy wouldn't exist without physical objects to express it through, and they all have to be produced.