If you look at GDP on a percentage basis, the US actually continues to hold steady if not actually grow. Now, there is a major blip in there. After WW2 US GDP skyrocketed. Which makes a lot of sense since many of the other industrialized nations were turned into rubble while the US was barely touched. So, there has been some decline vs. those numbers (hence why the 50's were considered the golden age in America). Yet if you look at the start of the industrial revolution until now, while eliminating the blip after WW2, the US continues to slowly grow while being the largest GDP nation in the world. Asian and Latin American countries have grown at a faster rate in the last 1/2 century, but much of that was at the expense of Europe and 3rd world countries, not the US.
On top of all that, it may be tougher than usual right now, but there has been much worse. Also, if you are worried about college, just realize that the unemployment rate for people with Masters degrees is around 2% (that is actually up, normally that is the bachelors degree number), and that includes every Masters degree. Get an advanced degree in a real field with a good job outlook and you won't need to worry about work.
If you are wondering how to pay for it? Go to the best public university in your state, get scholarships (if possible), get grants, get loans, and it's a piece of cake. I did it with no financial help at all from my family. Sure, there were some days I had about $1 to my name (literally!), but I got through and enjoyed the hell out of it.