I have left some older systems on for extended periods a few times because I was either somewhere I couldn’t save and didn’t want to lose a bunch of progress, or games that didn’t have save capabilities and I had to stop playing for some reason. Other than that, they always were and still do get turned off.
I’d rejoice, but I’ll believe it when I see it happening consistently. I want smaller, denser, and richer worlds. Not giant, sprawling, and barren. It doesn’t add anything to a game for me if I have to walk or drive 10 minutes to get to my next location and it’s just empty in between.