The current state of the game is different from before. It's true that they're seen as an annoying weapon by many, as evident in this thread. But, a step toward re-balancing is still needed. Dealing +1hp/ap per stab wouldn't be game-breaking. It merely offers a bit more damage incentive, as stated.
It will still be the worst melee weapon of them all. Honestly, it's such a minor buff I'm surprised it's met with resistance, but I guess that just shows people's bias against speedy daggers in general.
In other words - yes you can keep the item nerfed, but a re-balance is still needed to give the item and its minuscule player base the love it deserves.