imo the rule is fine the way it is as it states 'You may not actively enter or continue any combat situation for the next 15 minutes.' so if someone shot at you then of course you would be able to defend yourself but just not start gunfights.
The way I look at the current rule is it allows you good time to just enjoy the RP with the medic
. I believe the thing that would discourage people to wait to be revived is how long the fight could take, If you know it will last 20 minutes the medic can't come to you wouldn't wait.