Interesting, at the moment I'm writing a timeline from 2010 to 3025 for a writing project, which is fun.
Of course, the plot calls for an extensive alien invasion in the year 2090, which devastates most of earth, ----- though after it's stopped does leave behind a lot of alien tech to exploit.
Back to reality though, I agree that the us collapsing would certainly be a long way from the end of civilization as we know it, ----- in fact I find it quite worrying that lots of people make this assumption, certainly it's not one I'd make about the Uk, and I find it quite easy to imagine most of the world going on reasonably happily if the Uk collapsed, ----- allbeit with a lack of hal, doctor who, etc.
I agree bad things will happen if the Us goes down certain routes, though for the economic side of things I would like to point out that alternative energy sources, electric cars etc are already available, it's just that with the various large oil companies buying up alternative energy research and attempting to make proffits from oil sales, they haven't had a look in yet and won't until oil becomes even more scarce, ----- which at current prediction it will (I've heard estimates of it running out in about 20 30).
A more worrying problem is the distribution of wealth across the world, and some of the things the world trade authority and the World bank have been up to, ---- and a friend of mine (who has a degree in geography), is fairly certain these will cause a war at some point in the next 50 years.
the thing I worry most about personally is paranoyer, paternalistic government policy (in the Uk as well as the states), and reduction in freedom. With some of the laws passed recently, and the amount of political power held by the government which is continually being used, the creation of totalitarian systems, ---- in the Uk and probably in the us as well is something I see as a worrying possibility.
In that sort of system, I'm worried what would happen to any group of potential inferiors, Blind people included.
On the other hand, at least people are watching out for this sort of thing.
Technology wise, it'll depend upon which way things go.
If things go the virtual control route, Blind people will have more problems, sinse the more realistic computer environments become, the less accessible they will be, and the difficult technology will be for them, --0--- look at the 3D windows displlay and windows arrow for an example of what I mean.
the ultimate end of this progression would be the holodeck on Startrek, which would be just as difficult for A Vi person to navigate as a real environment.
the other way would be neurological, ----- as is seen in the newuromancer novels, and more recently (with lots of reference to developement and moddern tech), Otherland by Tad williams.
this way has potentially the idea of more accessibility, ---- not the least because as a side line of that sort of research, cybernetic implants, like Geordi laforge's viser in Startrek would be more possible, ----- in fact Otherland does have a character who is blind, but is able to interact with virtual networks nerologically, ----- though Tad williams doesn't go into details.
Of course though, these depend upon good enough economic and social background to develope.
I'll leave people with one thought though. As reguards the roman empire, Ceasar apparently noted in his diary that the steam from a boiling kettle could push the kettle's lid upwards by pressure.
this is of course the beginning thought of steam power, and eventually combustion. the problem?
with so many slaves around to do whatever job needed doing, why bother building a steam engine.
to an extent, I think the same thing happens today, especially with companies concentrating upon what sells, or what is commercial viable, rather than what is useful, ---- but before I turn this into a left wing wrant I'll stop.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)