The next-generation Army attack helicopter, The Commanche, was cancelled many years ago.
One of the main tasks of Apaches is to escort CH-47s loaded full of troops. The enemy combatants in Afghanistan (who knows what group they are truly affiliated with anymore?) know that downing a CH-47 will result in the loss of many lives. The Apaches have very little trouble finding enemy combatants lying in ambush because of their infrared sensors. Passive sensors detect and deploy countermeasures against MANPADS. So with sensors to detect the enemy, a very large cannon to engage the enemy from stand off distances, hellfire missiles to target technicals and AA guns (all found in Afghanistan), what is it really lacking as far as a low-intensity conflict attack helicopter?
A couple of difficulties that every Apache pilot has talked about is getting use to the eye monocle, and landing in sandy environments. The Apache has a very narrow landing gear, and the helicopter can very easily fall over (and has) in 0-visibility conditions caused by the rotor downwash.