this would never happen because pruned nodes are a bit more inconvenient, since you need to redownload everything on rescans/index rebuilds. I still run a full archival node for convenience and so I don't have to redownload everything.
you would only want to do this is you don't want to hold onto all the crap thats in the chain. you can still get your balance just fine without storing everything. there will always be copies of the full chain somewhere