Your absolutely right that USB is huge right now. But I know 3 years ago i had tons of usb storage devices. Now, i don't. I have an SD card I carry in my wallet thats there for emergency s. I have 1 2tb drive at home for backup. So if i come to the park, and want to show you a movie, or some music thats on my huge library of music back home, my iphone / ipad has all that data either streamed or quietly synced via mobile me.
I'm just saying, a lot our storage needs fall into 3 categories
- scratch disk
so everyone has their backup drives ok, but transferring files from one to another is kind of old. If i wanna send someone a picture or video or file I have bluetooth, email, mms, folder sharing, dropbox, the list goes on. There are just so many ways to share files other than needed to bring around a usb stick.
and scratch disk will need to stay because when your editing video you need a massive amount of storage for raw content. But serving that content is all over the net. I mean I don't have to give you the 300mb video for mp3car, you stream it from the website on ANY device. And if you want full quality, chances are you have subscribed to the hd podcast and the hd version is already on your device. (my podcast sync over mobile me)
so i agree definitely not 5 years, probably not even 10 years - but i think the trend is slowly going in one wire less world.™