Introduce a penalty on grey kill pvp

Well,
Pvping at during the leveling is something kinda weird and unbalance where the one that attack first will probably win (unless you are a warrior btw), it may not be fun for everyone but for me it is.
But, a lot of people goes mad and start bringing their 60 char to defend themselve which "kill" the pvp experience.
Like many other things, blizzard didn't really cared about it, pvp wasn't (isn't ?) their main focus in this game.
That's why i've think about a new mechanic to prevent higher level to intervene (?) and prevent anyone for leveling nor pvping.
The main thing would be to add a kind of debuff that would make the lv60 unable to attack by reducing their stats for XX minutes, this debuff could be stack and applied to their pets.
People may start to complain about how unbalance it will be as they won't be able to perform pve content due to this debuff.
But people have choice, if they choose to ruin the experience via ganking grey they may pay the price for it.
Some people may start screaming about the fact that it's not blizzlike but i and many other people, think that it would be a real improvement to the leveling experience.
Edit : One of my recent experience,
I've been killing allies in STV Ruins of Zul'Kunda, we pvped alot, great fun, even level, deaths on both sides, then one of them logged his 60 or called his friend.
You know what's coming next, corpse camping and other shit.
Edit 2 :
http://i.imgur.com/xTeJpxa.png
60s also prevent ppl from pvping as they fear them, which is great for PVP SERVER.
Pvping at during the leveling is something kinda weird and unbalance where the one that attack first will probably win (unless you are a warrior btw), it may not be fun for everyone but for me it is.
But, a lot of people goes mad and start bringing their 60 char to defend themselve which "kill" the pvp experience.
Like many other things, blizzard didn't really cared about it, pvp wasn't (isn't ?) their main focus in this game.
That's why i've think about a new mechanic to prevent higher level to intervene (?) and prevent anyone for leveling nor pvping.
The main thing would be to add a kind of debuff that would make the lv60 unable to attack by reducing their stats for XX minutes, this debuff could be stack and applied to their pets.
People may start to complain about how unbalance it will be as they won't be able to perform pve content due to this debuff.
But people have choice, if they choose to ruin the experience via ganking grey they may pay the price for it.
Some people may start screaming about the fact that it's not blizzlike but i and many other people, think that it would be a real improvement to the leveling experience.
Edit : One of my recent experience,
I've been killing allies in STV Ruins of Zul'Kunda, we pvped alot, great fun, even level, deaths on both sides, then one of them logged his 60 or called his friend.
You know what's coming next, corpse camping and other shit.
Edit 2 :
http://i.imgur.com/xTeJpxa.png
60s also prevent ppl from pvping as they fear them, which is great for PVP SERVER.