How "big picture" do you really want to get? The economy of the developed world is based on endless "growth" (essentially growth of GDP, which means growth of consumption). Is it possible to shift away from this either for environmental reasons or just to be "economically sustainable" and live with what we've got? I kinda doubt it. In the same way that computer chip companies are endlessly battling the laws of physics to keep Moore's "Law" going, we're going to be chasing "economic growth" for the foreseeable future, whether it's doable or not.
Overall, I don't think that things are that bad (for us) over the next 50 years. Sure, global warming will cause problems, but I'm guessing not catastrophe. I just read something about how tens of millions of people around the world are "joining the middle class" each year in China, India and lots of other more developed countries. (In these terms, "middle class" means making US$6k to US$30k per year: enough for more than food security, like medical care and educating kids, possibly buying property and definitely buying consumer goods). This trend is expected to continue for decades, and will bring about 2 billion (out of what? 8-10 billion people by then) of the world's population into "the middle class". That's probably bad for the environment, but my sense is that it's good for the US economy (assuming that the world doesn't continue to hate us more and more every year...) We're pretty good at coming up with crap people don't need and selling it to them, so hopefully that will continue working for a while.
More immediately, as an architect, I'm not really looking forward to the next year or two. (construction is very sensitive to the overall economy and is being hampered by the problems in the global credit market.) The construction industry is predicted to hold roughly steady for the rest of this year and contract by a few percent next year, because that's how long it takes for overall economic issues to ripple through the multi-year plan->design->build process. If in 2009, I get 93% of the business that I got in 2007, I'll be OK, but growth would be better.
Overall, in any economic downturn, it's time to realize how all the crap in our lives isn't that important. Heck, I just got a dog, so if I'm "forced" to spend less time at the office and more at home, that's not so bad. Over the last few years, we've been trying to come down to the Red every other weekend in spring and fall, to the tune of $100 to $120 per trip in gas. If things really slow down, then maybe we'll be making much longer trips to, uh, justify the gas cost
Bacon is meat candy.