Make Reckoning trainable and change it to:
5% of Base Mana
Instant, 5s cooldown, Requires Melee Weapon
Instantly counterattack the enemy, causing Holy damage equal to 50% of weapon damage. Only useable after being the victim of a critical strike.
It's modeled after the warrior skill Overpower. You get critted, the button lights up, and you smack them back once. No charges or any other silliness.
So we get another button to press during combat, which makes soloing a little bit more interactive. It does Holy damage which helps with Righteous Fury and tanking. It's not usable if you aren't being attacked, so it doesn't really change us in raid situations. It's based on weapon damage, so it scales as well as emphasizes the melee aspect.
Then in the place of the current Reckoning talent, we could have:
Requires 20pts in Protection
Improves the damage done by Reckoning to 60%/70%/80%/90%/100% of weapon damage.
Admittedly, you can't do Reckoning bombs in PvP anymore, but an instant attack for 100% Holy damage is still pretty sweet. I also think this is more in line with the original intent behind Reckoning.