Duck Sauce, nice joke about the crystal ball. But I certainly don't want to present myself as a prophet. When capitalism will collapse is irrelevant. My point was that it eventually will do so, definitely.
In a purely communist society (which is, of course, an ideal), goods are only produced because they are needed, because they have to be consumed. In a capitalistic society, you always have to produce and consume more than you need. Production always has to rise, otherwise you can't make any money, because you will only receive what you spent. You see the self-destructive logic in this system?
If you don't produce more tomorrow than you did today, your system will fail. Now, isn't it somehow obvious that there has to a limit where you just cannot produce more? Where you cannot consume more?
And I think we are indeed very near this point where the markets are just so oversaturated that this system will eventually show its ugly, selfish and short-sighted face.