* Windows falls out of popular use for residential people / People moving away from using PCs as we know it.
* Steam client not being available for the mainstream OS of the day.
* Most of the games in your library not working with the the mainstream OS of the day.
* A new platform replaces Steam and it has newer remakes of classic games.
* We are all in our 50-60s and lost access to our accounts long ago because we don't play games anymore.
Steam probably won't be killed off in one day. It will die gradually as it falls into disuse.
* Windows falls out of popular use for residential people / People moving away from using PCs as we know it.
* Steam client not being available for the mainstream OS of the day.
* Most of the games in your library not working with the the mainstream OS of the day.
* A new platform replaces Steam and it has newer remakes of classic games.
* We are all in our 50-60s and lost access to our accounts long ago because we don't play games anymore.
Steam probably won't be killed off in one day. It will die gradually as it falls into disuse.