they can't be arsed to repaint a lot of the white lines around my way (in england) anyway, so it's in practice a lot already by accident
on one bit of road in particular i tend to find it means that cars end up much more in the centre of the road than they do if there's lines. i've nearly lost a wingmirror almost every night since it's been dark at 6pm where someone has been too close to the centre because a) they don't want to get their freshly washed white car muddy b) they've no idea how wide their car is and c) potholes. everywhere.