Doing so requires either preserving or emulating obsolete hardware. There's a small but passionate contingent doing that for games; not so much for app albums.

I'm curious to see how this works out in the future too.

Emulating an NES (15 years ago, woot!) is a LOT more technically straightforward than emulating either a Wii or iOS. But in 15 years, will emulating 2013 iOS seem about the same level of challenge as emulating an NES today? I honestly don't know, but we will find out.