An article in Citylab explains The Amsterdam Bridge Dilemma. Bascially, Amsterdam needs the area north of the IJ to grow, but for that to be attractive, it needs to be reachable by bike. So a tunnel is not going to cut it, a bridge is necessary.
But tall ships are crossing all interesting locations right now, so either the bridge has to be very high – not attractive to bikers or it has to open, in which case it will be open 50% of the time in high season.
Solutions are possible, but they will restructure the city and tourism in the city. In itself also not a bad thing, but complicated.