I’m cautiously optimistic that we will survive the next 50 years (70/30), and if we manage that, then some reasonable approximation to the rest of eternity seems likely.
Based on the exponential trends in technology that have been stable for over 100 years, in 1,000 years technology will be beyond the ability of most to imagine today.
I expect that there will exist a broad spectrum of humans, cyborgs and AIs.
Human population on earth will probably be about double its current number, but populations in large habitats in nearby space could be many times that number.
I expect that most people will live a very high tech lifestyle, essentially free to do whatever they responsibly choose to do, where responsibility involves reasonable care for the life and liberty of others, and by necessary implication to sustaining the environment that supports us all.
I expect that money and exchange based thinking will be largely a matter of historical interest, though it may survive in a few communities, most will exist in abundance based communities where such limits as are necessary are agreed by consensus, and most people are sufficiently responsible most of the time that those limits are rarely approached. The main limit will be available energy, and that will be much higher than most experience today, about 20KW continuous per person, so sufficient to sustain a very interesting lifestyle. Travel networks will place anywhere on the planet within a couple of hours travel from anywhere else most of the time – should people feel the need to go somewhere physically, rather than using a remote sensory robotic avatar.
So l look forward to indefinite life extension, and fully automated systems of production, to enable a culture based on universal cooperation, rather than one of forced labour and exchange.