The internet already does this for me if I need it, which is extremely unlikely. So the point is lost on me, I/you would struggle to find any large scale case where that was a lifesaver.
Furthermore my "offline" media like UHD blurays - which I own hundreds of, seems contradictory but don't you worry, I do not own a device capable of playing them outside of on the PC which I use to rip them to my Plex server, those offline bluray discs routinely go bad/arrive in poor condition. And it's not just me, search any forum like blu-ray.com, there are hundreds and hundreds of people routinely returning bad physical discs because they skip/mess up on their players.
So if anything I think having digital media is a lot safer than physical based on my experiences.
I can still download every digital game I've purchased, from even longer than 15 years ago. Even 25 years ago. Games I purchased 35+ years ago and can't even run (like on floppies), I can still purchase and play digitally from Steam/GOG or download if they're abandoned. So it's a very weak argument.
If I was going on a plane with limited internet, or to a remote island, I'd simply load the games up ahead of time, set the device to offline mode, and be done.
If I was going to permanently relocate to the hermit lifestlye and live life unplugged from the world entirely, no cell phone, no internet, no TV, nothing at all, no electricity even, then your argument starts looking more appealing, but probably be better off simply buying a few handhelds capable of emulating GB through Switch /PS3 and loading them up on a 2TB card/drive, and get myself a nice big solar panel.