Traction in what way ...
Doing this is not entirely uncommon in front-drive rally-car-type situations. It allows more body roll - sometimes rather unsettlingly so - but it allows the front wheels to follow the road surface better. It also transfers the balance of overall roll stiffness towards the rear, which tilts the car's balance away from understeer and towards oversteer. On pavement, the excessive body roll (combined with MacPherson struts that don't have the greatest camber curves) could lead to excessive positive camber which could reduce grip. On loose and bumpy surfaces, where there isn't enough grip to get to those levels of body roll, the no-antiroll-bar situation works better and lets the front wheels follow the road up and down better.
On a rear-drive car with that much power, shifting the roll stiffness balance towards the rear could make things a little exciting, and it could lead to the car wanting to lift up the inside rear wheel under cornering. On a front-drive, this doesn't matter, and VW's traditionally have that cornering attitude. On a rear drive with an open diff, you just lost all forward drive until that wheel comes back down again. If it has a limited-slip diff of some sort, that would tip the balance even more towards oversteer, particularly in the wet.
Most rear-drivers are tuned so that, if anything, they'll lift up an inside front before they'll lift up an inside rear.
I'm thinking, not a good idea.