Don't forget people, we've all got to get through 2012 alive first before we even consider what will happen in 2050 lol.
I've read through everything that is said, and to be honest I'm surprised that no-one has thought that we still have a chance to turn things around.
Someone mentioned this earlier, but for some strange reason we've always been obsessed with our own destruction, either by our own hand or by something else. And in some ways, I don't see it as a bad thing entirely because of the simple fact that it guides us (well, the few of us with some common sense) away from harming ourselves or others.
My personal opinion of what things will be like in 2050? I think it'll be better in many or all respects, hopefully we'll have put an end to most disease as we'll understand that mind rules over matter. We'll be living in a positive utopian world, as we'll also know that not only are we made of the same thing physically, we are all 'one' in a spiritual sense.
The next 5 - 10 years are going to be the most crucial ones, and even if we don't pass them unharmed, I highly doubt it'll be the end of humanity and 'all' life on this planet. I reckon there will be pockets of people in remote places around the world, who'd have learned not to make the same mistakes we and our ancestors made.
But still though, the future isn't set in stone, it's constantly changing and it'll be written by our species as a whole, not solely by the Powers That Be (a.k.a. the oil barons, political parties, or religious leaders). The little man who goes about his daily life will have more say than the politicians over what happens.
'We' the people will have the final say.