I see what you mean, I suppose a physical plug is more or less 100%. However I still think diligently written software can solve this. The headphones I use say

I see what you mean, I suppose a physical plug is more or less 100%. However I still think diligently written software can solve this. The headphones I use say "connected" and "disconnected" so it's not happened to me personally. iOS also has an indicator of what output it's going to use right next to the play/pause on the lock screen. Also to be honest I'm not that considerate a person and don't really care if I accidentally disturb the people next to me for a few moments. Regarding wires, I've got the opposite problem now to where I'm so used to wireless headphones that if I used wired ones I'm liable to try and walk away from the device without unplugging.