That would be one of the neat things about the variable approach is the change could be triggered based on any of the existing triggers in the system.
There’s certainly the trade-off of ease-of-use though. Being able to more easily configure the Media Tile to cycle through a set of media sounds like a really neat idea. I’ll leave the thread open for further feedback from the community. Community feedback is a key part of how we prioritize what we work on - the more interest there is from the community, the more like it is to get prioritized (and the opposite is also true).
An approach like that could work here too. Even for images that you don’t directly store (eg. a URL online), you could setup a script that would redirect to your desired image. Then set the tile to periodically refresh and it would pick up the ‘new’ URL each time.