So the blockchain is already about 386MB and we're just getting started. Most financial institutions are required to keep records for five years. Is there any plan to prune the blockchain or address this side effect of 10 second blocks?
The raw chain (just blocks and transactions) is 88 MB
The index used to maintain quick access / sort /etc is 277 MB
Future plans call for removing the TITAN information (encrypted data) from the blockchain and relying on a notification service. This should reduce transaction sizes by up to 50%
The next release will also support paying transaction fees in USD as well as bids with USD/CNY/etc. This should reduce the number of signatures per transaction.
Reducing the size of the "raw chain" is easy, reducing the size of the index on that chain is much harder.