Such products would be online-only, DRM-bound, with gaping security holes for any two-bit hacker on the other side of the planet who wants to change all your wallpapers to goatse. I'll pass.
Yeah, it's a shame that we only have the Internet of Shit right now. But it's not baked in the technology. You can have secure IoT devices with custom builds, so I'm sure that there will be secure e-ink wallpapers (although maybe not on the mass market).
I for one would love having every inch of my interior walls e-ink, changeable on a whim, and would likely pay $1 to download a new wallpaper/design on a regular basis.