I like this analogy Chris. We're already seeing an uptick in interest by developers around the platform: http://blog.bitcoinpulse.com/bitcoin-big-hit-with-developers.... The most likely immediate use of your "Internet Spending Money" would be online services including apps, games, online advertising, storage, hosting and more.
I also think this issue is going to become more urgent as native mobile apps that do have a "global" (OS-wide) payment system become more dominant. Open web needs something analogous to compete.