I think the modern midfielder has to do a lot more than it used years ago. Sadly there are not many around that can do it.
Gerrard is as close as you can to to a complete footballer. He scores, can defend, head, tackle, pass short or far and has the fire in the belly.
Liverpool needs a DM that can tackle and pass the ball to the creative players to carry on the attack. He should be strong, very mobile, aggressive and most importantly intelligent. Or we can just bring back Didi Hamaan.