Chances are not slim for turntablism at all.
Saw some amazing turntablism on Saturday with a DJM 600, defintley opened my eyes with the capabilities of this mixer.
Maybe so... But you wouldnt ever find Q-Bert or Craze, Clever or any other dj using a djm 600. Why?? Becuase they are not designed for it. Sure, a talented turntablist can use them for turntablism, but it doesnt make life easy to do it. Plus, the faders would wear out in a very short space of time.

"dont think any bedroom dj needs a 4 channel mixer unless they have 4 inputs, pretty simple equation."

What if he upgrades his setup?
The whole point of this scratch mixer arguement started by asking "If you are only ever going to use 2 channels". If you have plans to upgrade to 4 channels, then fair enough, get a 4 channel mixer. But i dont know anyone who ever uses 4 channels reguarly for it to be a warrented reason to by a mixer. Yes, 3 channels, i know a lot of people who do 3 deck mixing, and you can still get 3 channel scratch mixers. At the end of the day, its all down to personal preferance, and for me, i need something more than 300 channels that im not going to use, and a dodgy over used fx box built in. I like to have a quality built mixer, that lasts. You can say to me that "The djm 600 is a quality well built mixer", but put it next to an ecler hak or a rane, and it will feel like a fisher price toy...