Earlier quoted context omitted.
None of the what the crypto-currencies promise is impossible to do with a few independent central vendors implementing that same standards for payments and contracts. And centralized solutions will always be faster.
Centralized databases are faster. Centralized consensus is dangerous for the same reason that a dictatorship is dangerous. The organization in charge of said solution would exercise dramatic control over the execution of said code. You need not look very far into the past to see egregious examples of organizations abusing their centralized position over data. I shudder the thought of a centralized actor having the sa…
Most crypto-things have this idea that they servers validating transactions have to be compensated and that anyone can do this validation. (validation == mining)
Having a few well regulated entities do all the mining is a centralized system that can be verified externally. Without all the cost of decentralization. And with the added security that validators are trusted entities.