The right turn lane is removed. Now, instead of having straight traffic moving through while right turn traffic shifts to the right out of the way, that traffic

The right turn lane is removed. Now, instead of having straight traffic moving through while right turn traffic shifts to the right out of the way, that traffic will have to slow behind the right turning cars. The added set-back of the cross walk helps, since one car can wait for e.g pedestrian traffic completely out of the flow of through traffic, but there is little doubt the traffic will flow more slowly. As somebody elsewhere said, if you get more people riding, you are removing their cars from the road, but there is a real chicken and egg problem, as drivers will be very upset if they see their commute lengthen.