An extremely small fraction of the inflated value of these coins is actually part of - interacting with - the global economy. Most of it is not and will never be liquid.
Most of it has been and is locked up, not touching other aspects of the global economy, and most of the actual bubble value will vaporize without ever touching any part of the 'real' global economy.
It's the specific reason there is nothing to fear about the inevitable implosion of this crypto-coin bubble. Not to mention, after it implodes, the real money will be made as throughout history (whether we're talking the auto bubble or the internet bubble or the oil prospecting bubble).
The dotcom bubble implosion wiped out trillions in moderately liquid value (the US stock market as one example being radically more liquid than the coin market overall), a sum that makes the crypo-coin bubble look hilariously trivial (even if you inflate it up to $500 billion), the global economy kept trucking regardless; US GDP has expanded by ~80% since the year 2000.
Sun Microsystems during the peak of the dotcom bubble, all by itself, was overvalued (peak market cap near $200 billion, probably worth more rationally $60-$80b tops) by more than 2x the total sum of all bitcoins.