I for one, would NOT want to download ~1.4GB and wait an hour while writing it to mSD card every time I wanted to do an apt-get update / upgrade, which normally only grabs a few MB and sometimes deletes stuff and takes 10 minutes max.
Between the three uSD cards I test various settings between, I'd have to wait at least three hours for updates, just to install.
This idea is silly.
Current project: Handheld gaming / coding system.
Progress: Prototype complete, but has a tendency to burn the user.
Additional cooling required.