We don't actually know if the ride is really delayed or if the plan was always to wait until Mid-July.
The only reason Jurassic World feels delayed is because it didn't match our guessed dates. Universal may be trying something new and not unveiling an opening date until a week before, for crowd control.
I highly doubt it will be in August or September when this ride opens. Plus, early softs will probably occur during a week day so the team members don't get flooded with people while training. I personally think Jurassic World is on track to be opened around July 12-15. That seems to be Universal's favored "summer" dates. I could be wrong. I just find it funny that we all keep saying Jurassic World is behind schedule we none of us really know when they planned on opening it.