So, based on the official wiki:
https://en.bitcoin.it/wiki/Scalability

and this video:
https://www.youtube.com/watch?v=gQoykhNoBbY

For the network to process VISA's transactional capabilities, full nodes would need to have 3TB in storage created every 21 days.

So of course we have SPV, which is likely going to be released as part of the official client in the next release.
But doesn't that leave us with an ecosystem made of 'supernodes' while everyone else chugs along with their SPV client, centralising the control of the block chain into the hands of a few?

Thank you for any insight.