I meant that even today, it's near impossible to predict the state of the economy next week, let alone in 20 years.
We're also talking about a completely different society, like most societies changed from the '60s to the '80s and so forth. Different needs, different priorities, different state of affairs in a global level.
Take Google, for instance. Google first offered a useful product on 1998. Turned a profit first in 2001 ($105 mil). Its IPO took place in 2004 ($23 bn, wasn't it?). Even if one were so dense as to deny the upcoming global dominance of Google (at least in online search) back in 2000, those timeframes are so off the 20 year mark it's not even funny.
And yes, of course I expect progress (regardless of scale) in the future to take place a lot faster. We've already seen trends spread overnight. Who says someone won't be able to capitalize on such internet behaviour? Even if I'm too irrelevant to tell, I seriously doubt there won't be someone in 20 years' time.