It will have some effect, although the wake generated by wings etc will still be the same the underfloor downforce was designed to be better preserved within the tunnels, thus also making for closer racing. With reduced ground effect, by raising the ride height, the car will be less 'stuck to the floor'. Mercedes know this so they wanted the ride height rule changed for all the cars..Shouldn't make much if any difference in terms of how close cars can follow - it shouldn't affect how the bodywork and wings generate downforce (and the cleaned up "wake" they generate), but will obviously impact how much downforce a car can generate (meaning more sliding around, and potentially more tyre wear for those affected)