The Netherlands is not going to be anywhere it's once in a generation 2014 performance. Japan is currently the strongest nation on the women's side and will probably win 3 golds (500, 1000, 1500 and team pursuit) and the men's team, while still the best in the world, isn't as dominant as it was in 2014.
I'll go on a limb here and say that I'm going to be very surprised if the Dutch get a sweep.