I actually use SD cards with a proper USB reader as a USB Stick because when the cards become too small to be useful, they get re-purposed for something else instead of going into the trash. Also you are slightly less likely to destroy the data on it if you manage to break the USB reader unlike a USB Stick which I've seen folks snap off which requires some decent soldering skills to fix. A 1TB card would be pretty cool.
On the downside thou what's this crazy 1TB SD card going to cost? I can't imagine it's going to be cheap.