Neat thread! I actually find it hard to add anything, as Mars' thoughts overlap a lot with my own.
I even remember synthetic meat and real meat being goods in Elite, so I certainly agree that there would be a two or perhaps even three class economy with the upper and middle classes buying real meat, whereas lower classes may only afford meat "from the barrel" or, in the worst case, recycled proteins. This would depend a lot on the individual planet, though, for many worlds may have the capability to support their own farming, whereas on others it could be prohibited due to environmental or even legal concerns. And needless to say, interstellar import might add a lot to the price tag, not to mention any customs fees. Something else that springs to mind are compressed meals in the shape of some small cube or so, which only take on a slightly more natural shape and form when prepared. Easy to store, long expiry period, perfect for small homes or a starship. Think Back to the Future II or Alien 4.
I also agree with sleep becoming much shorter thanks to various enhancements, either technological (REM Enhancer implant) or chemical (some pill that just overrides the need for sleep altogether) or even genetical. Already, humanity has made a lot of progress in turning people into worker drones capable of staying awake 24/7:
http://science.howstuffworks.com/life/sleep-is-so-last-year.htm
For washing, some reading on the interwebs seems to suggest that sonic showers are sort-of possible, and have in fact been in development at some point in NASA's history before the project got canned due to budget issues. The trick is that this real sonic shower still used water, just a lot less of it, essentially using ultrasonic waves to vibrate what little soap water the body was sprinkled with (in the form of a steam cloud) to achieve a higher efficiency than with a steady stream of water.
A normal shower that just keeps recycling its water - possibly even tied into both the drink dispenser as well as the toilet, for greater efficiency - also sounds interesting and certainly more low-tech. That being said, the lack of gravity onboard a starship might constitute a problem, though there are ways around it. Here is an interesting document about zero-g cleaning made for ISS Alpha; it also goes into detail regarding alternate methods of cleansing such as using wet towels to rub yourself off:
https://archive.org/details/nasa_techdoc_20010098604
The nanobot idea mentioned by ianw is very cool, though somehow this sounds like something only available to the rich.
As for sports, I'm not sure a lot would change. Probably just made more efficient by introducing more pharmaceuticals that somehow support your efforts. Perhaps there would also be implants capable of stimulating your muscles, but I'm not sure how much of that is possible without triggering unwanted limb movement or other such rather unpleasant side-effects.
All in all, it may well be that a lot of scientific advancements won't be available to the majority of the people, just like it is today. Perhaps there will even be a universal or at least regional degeneration of technology that would result in the most modern devices becoming unknown or at least a fabled rarity. Personally, I feel this might be a development very suited to Elite, as it goes along well with living on the edge of civilisation. Think Battletech or Firefly, for example.
I would expect the 'virtual sex' industry to be huge, allowing you to have your pick of partner/s in a virtual environment which you body and brain is hooked up to, possibly even being able to design your perfect partner and choosing the environment.
Ghost in the Shell?
I mean look at all that cyberpunk literature from the 1980s. It was all about global networks and corporate power and the struggle to retain our humanity in the face of technology that was moving quicker than we could adapt to it. We've pretty much got all that stuff now, but for all their prescience those cyberpunk writers never foresaw what we'd use it for: funny cat videos, Facebook, online memes - and threads like
this one.
I dunno, there are some developments such as an increasing gap in actual social contact, declining birth numbers, readiness for violence (even in children) and the drastic redistribution of wealth that kind of tie into what was suggested back then. One
could say that the things you mentioned are merely artificial replacements for true interpersonal relationships, for which we (or at least some of us) now lack the time as we spend it all on our jobs and the addiction to some sort of screen - that's kind of grim in its own way, perhaps even moreso because it looks so innocent on the surface, yet in a way hides the ugly side of living in the 21st century. "Watching homeless people and civilian war casualties too depressing for you? Have some cat pictures!"
If we don't I predict it will have been mandate by some future government. People without feelings would be easier to control and tax, and of course, they would be dictating this to us 'for our own good'.
You haven't by any chance watched
Equilibrium, have you?
