Truly separated infrastructure would require over or under passes at ever place a bike path and motor vehicle path intersect. Even drive ways! And obviously anything termed s separate bike path isn't going to go everywhere I wish to go on a bicycle. So we still need to focus on the integration of bicycles with motor vehicles for those times. And that's going to take a change of how drivers are trained. Which in the USA, most are not. They just learn from a parent or friend that learned from their parent or friend. Even if one took high school drivers ed, most are a joke IMO. They only train for skills needed to move the car on the road and to pass the written test. little if any about how to interact with traffic other than don't hit the other cars.