There are already options to turn off WiFi and bluetooth automatically after a set period of time.
It would be really nice to enjoy the same privacy conveniences for these other privacy concerning permissions. I like to keep these off and then turn them on when I need to use them. But I mostly forget to turn them back off afterwards.
While some apps do allow a "only this time" permission, that's not always the case nor is it always practical or functional. For example, location services with play services won't work properly (or at all) if you don't give it the full permission.