If you could track to to a bitcoin address, it ought to be possible for the crytpocurrency community to "blacklist" an address used by thieves. Since the transactions have a complete history in the blockchain, an exchange could reject transactions that are traceable back to an address involved in theft, fraud, etc.
This is so wrong on so many levels...
Without getting into technical details on how exactly would you do that, think about this: who decides that "an address involved in theft, fraud, etc."? What happens to a legitimate merchant who sells a product or a service to one of the addresses "involved"?
It's seems you would like to bring over the clusterfuck that is credit card chargebacks/disputes over to crypto currencies. Thank you, but no (and thank Satoshi this is not really possible).
You say it's not possible, but if you have the complete list of transactions, it is possible to deny exchange to other currencies. You can't prevent exchange of coins within the currency, but there's no reason anyone has to willingly accept a bitcoin that was originally stolen from a miner in exchange for a traditional currency. In reality, the value of bitcoins today is only as good as what you are able to exchange them for in terms of real goods and services, or in traditional currencies. While a thief may steal a bitcoin and pawn it off on someone else, here's no rule that says an exchange has to accept that bitcoin address for exchange with a dollar, or other currency.
I'm sure you would love to be arrested in a bank because the greenbacks you gave to the cashier were touched by your friendly neighborhood drug dealer a couple of "hops" ago, based on an anonymous tip
. What could possibly go wrong with that.