It's doubtful that
anyone will be able to hold the entire blockchain at some point in the future, should Bitcoin become a mainstream thing.
Here's some interesting data (from 2006 only for the US)
Average daily number of transactions:
- 60 Million credit card transactions
- 100 Million Interbank ATM transactions
- 60 Million ACH transactions
- 15 Million SWIFT transactions
- 365.000 CHIPS transactions
- 521.000 FEDwire transactions
- 700.000 CLS transactions
So that's a cool 237 Million daily transactions, in the US alone,
excluding cash transactions.
Let's assume a conservative average of 3 daily cash transactions per person (buying the paper, a hotdog and a pack of smokes). That adds a cool 1000 Million transactions for the US alone right there.
Yeah. Better go grab a YottaByte HD real quick.