We've moved to doing nightly rsyncs. Laptops rtc_wake at 4am, but of course suspend again before the backup starts if they're not plugged in. Backups are done over the local network from the "home server" to a big encrypted btrfs usb drive (so we get snapshots). And keep the offsite copy freshly rotated by visiting my parents :)
But we still some times forget to plug in the laptop at night.
Clue: Everyone is not itunes compliant! Grr!
Edit: Here's what I use https://play.google.com/store/apps/details?id=net.mori.andro...
That said, your workflow isn't representative of most users, if only for the fact that most users don't really have a workflow per se, they just do whatever's easiest at the moment. People have photos all over the place (mobile devices, multiple computers/drives, social networks, email, etc.), and Everpix pulls them together into one unified collection.
How difficult and awkward would it be to have an external DVD/Blu-ray writer, a spindle of disks and a permanent marker? It's not like you're doing the backups in one go, after all. A disk every couple of weeks to a month for the average Joe isn't too much. This isn't a professional photographer after all.