here is another story. transaction costs become too high, naturally, because distributed ledgers don't scale well. clever entrepreneurs come to the rescue. By building ontop of the existing infrastructure they leaver the advantages of bitcoin in order to create censorship resistant centralized ledger systems. to the end user consumer its virtually indistinguishable from bitcoin except that it has super low fees and instantaneous transactions. and everyone lives happily ever after, except for people who get cancer.
To answer your post, though,
Wasn't the problem so hard that it forced the creators of Bitcoin to resort to decentralisation in the first place? If you want an alternative, why not something very simple: a benign leader who is simply has the people's best interests at heart and is smart enough to understand what's going on?
Would I be endorsing democratic values, if I said that I was sceptical whether such a person could be democratically elected? Maybe if there were many, smaller currencies...
Thats a really good point. So i guess i should say pseudo centralized. basically these institutions would tread a happy middle ground between bitcoins level of decentralization, and a full on "one ledger to rule them all" scenario. Let me explain with an example.
Suppose that we have ledger operator a b and c. You want to make a bitcoin transaction with your buddy and you are using operator a and your buddy is using operator b. You broadcast your intention to operator a and b and a and b communicate with each other and agree that everything looks good and then the transaction is complete. A and B store up a balance of payments for all transactions with each other, and once per day, who ever is liable on net clears his obligation to the other using the blockchain. Notice that C never had to download any information relating to this transaction. Thats only a 30% savings in total network load, but suppose we have 100 operators, than it becomes a 98% savings. Using this framework, cryptobanks can pop up on the dark nets. Governments can take some of them down, but they would end up playing a never ending game of whackamole. That is the sense in which it is censorship resistant, and the sense in which it is centralized in that each actor is maintaining his own ledger.
There are other ways to make it more efficient also. Such as banks wouldnt need to actually communicate all transactions with each other either. Both banks could bundle their transactions relating to each other into blocks, then hash the blocks and compare hashes, and only explore the transactions in detail if the hashes dont match. Thats just one example, there is tons of creative stuff they could do to reduce network load.
and of course the blockchain would still be super great for many purposes. just not buying a soda or a sandwich.