While idea is not bad, i have to object symptoms which would come along this - groups would travel unspotted thru hostile territory, striking from back or sandwiching defenders from their own zone. This would allow them to travel unspotted same as sneakers does, so I can't support this, sorry.
I agree, there should be SOMETHING that lets you know if there is someone in your territory, but why should you know about enemies in territories you don't control? Maybe in zones that your faction owns, you see the enemy count, similar to the way it is now but ONLY in zones you control.
Currently if you go into a zone, without knowing anything else, you see if there are players there through ZC timer. If its contested, you immediately go onto the defensive (or leave entirely).
This also passively buffs sneak. Sneak players do not cap. You become accustomed to watching the ZC timer to see if people are there to attack you. If you don't see CONTESTED, you assume you are alone and let your guard down. This allows sneakers to get a free jump on you.
Without the constant ZC timer, and CONTESTED, players will always be on guard. I remember before ZC timer, when I solo farmed I would close every door behind me and played more carefully. When I went out to PvP, I would look for open doors and hunt players through multiple zones walking their same path.
Now I just look at ZC timer.