[grrowl]

Well just look at how quickly we fill up phones with lowest-tiered storage (although this is artificially contained). There is also a technical hurdle of building apps in a way that they can be "lazy loaded" — my phone's 4G is the fastest internet I have access to (in Melbourne, Aus) so it's not inconceivable that the "core" 10MB of Facebook.app would be ready in seconds, with the "full" 77MB installation ready in under a minute.

Personally, my phone is full of photos. Cloud syncing allows for recent photos to be on-device and instant, while there's more than could ever fit on my phone stored just seconds away. Once Photos.app and Facebook.app are on-device, I could sign in with my cloud credentials and they automatically log me in and all my content is "just there" (this is true today). When we can log into any device, display "my" home screen with not-locally-installed YikYak.app (46MB) and run it on-demand we'll see true portability of profiles and portability of devices will begin to take a back seat.