While SNW and the Mario kart ride may be “old hat” to a percentage of the population , it is still going to be an enormously popular location in the parks for families. I’m thankful that the isle of berk is “across the street” to help take in those guests. These are also the first two lands in the park , so assumingely most guests will wander there first.
As far as potter ride not being open, I’ve been kind of expecting that for awhile. Hell, I’m shocked that the other attractions are apparently operating so smoothly. It’s very common for parks/rides to have growing pains opening day.