Obviously, your wishes are even less practical than mine.
I take a different view. What I put forth was indeed a set of criteria which have to be met for my ideal world. What you put forth were ways of *establishing* your ideal world. Like you said, more practical; and therefore more open to critique than just a general expression of desire.
When I wanted to provide better housing for the masses of urban poor, you cited heritage sites and funding as objections.
You didn't mention the poor masses; you mentioned 'retrofitting for increased efficiency', which crosses class boundaries. Retrofitting cities for increased efficiency IS going to result in the destruction of historic centers and buildings if you actually want to maximize the efficiency. Even retrofitting it to a limited degree is going to lead to mass evictions; which I can unfortunately guarantee is going to hit the poor harder than it'd hit the rich.
The mass evicting part was an assumption based on nothing I said; the buying out part was based on present economics.
Mass eviction is the inevitable consequence of seriously retrofitting cities for increased efficiency unless you're just going for token efforts. And while I want a post-scarcity model where money and what not no longer exists; we're still stuck with money for a while it seems.
I can make some assumptions about colonizing "the solar system and beyond" i.e.
that building human habitats on other planets* would be rather more expensive than building better apartments in Chicago. (*Well, really, just one planet and a few moons are feasible. I wouldn't want to live in a bubble on Mars, but have no objection to your doing so.)
A number of things:
First, most planets and moons in the solar system are feasible colony sites (especially with near future technology); it isn't just Mars like you're probably thinking. There are quite well developed proposals for colonies in the upper atmospheres of Venus for instance; and similar construction can take place in the gas and ice giants' atmospheres. Secondly; why would we even build on planets or moons? Orbital habitats would be much more economical. Thirdly, citing cost when what you're arguing for would carry similar massive costs seems a bit... odd. Of course there's cost, however people tend to greatly overestimate the cost of current space travel, which is to say nothing for the decreased cost once a proper and self-sustaining infrastructure is in place. Finally, we're eventually going to *have* to colonize space. Making our planet-bound civilization more efficient is certainly a noble goal, but it's not a solution. Even if we were to reduce the population to under a billion we'd eventually run out of resources or be wiped out by a global plague or asteroid. Space colonization is the only way our species will survive in the long run.
AI distribution of goods is a fine notion (which has never been tried), but I suspect implementation would meet with more resistance, even, than urban farming (which is being done already.)
What are you even talking about? Who the hell is resisting urban farming? This is the first I've heard of any such resistance. I can imagine some might be opposed to an AI run economy; but what those people fail to realize is that to some extent it's already happening. People may not like the idea of transferring the power to control or influence their lives to an AI, but some countries already do this to a much larger extent than you may realize. My country for instance, puts the lives of almost one and a half million people in the hands of what is essentially a primitive AI that controls a portion of our flood defenses. There's no human intervention at all in determining when the barriers close, because humans make many more mistakes and because if the barriers close for even just an hour when they don't need to there would be a huge economic cost; since it'd cut off one of the largest ports on the planet from the sea. So in that we have an example of a government/society trusting a computer program with not just a significant chunk of its economy but also its population; why wouldn't we trust it with the entirety of our economy if the AI in question was much smarter and more development than what we have now?
This one, I find impossible to argue, as I have no practical idea what you mean.
I mean, simply, a means of gaining immortality through science and technology; immortality here being defined as not dying from natural causes. There are any number of ways this could feasibly be done; and there's a lot of research going on right now that might yield fruits sooner rather than later. While I maintain a degree of hopeful skepticism, some researchers think we could achieve human immortality in as little as 30 to 50 years. If you find this hard to believe, consider the fact that there's really no hard laws preventing organisms from living for thousands of years or more; it's an engineering problem, not a fundamental impossibility.