I think the latter is quite likely - assuming people will be with family this weekend, it might stir up interest in booking trips. While the south starts school vacations near memorial day, a lot of Northern Schools still attend until mid to late June, so a June 30th opening could get people thinking about their summer plans.
I have to say - I think Disney might be in for a slow year beyond this summer. I've been talking to a lot of "normals" (non-Disney nuts) and many are aware of the Star Wars land but are basically saying "we want to plan our next trip around that opening". I wonder if WDW will see an attendance dip over the next 12 months or so due to this...and then the massive spike they are likely anticipating.
I could see that. We’ve been going ~yearly and are going in a few weeks. Our next trip won’t be until fall/winter 2019-20 to wait for the craziness of SWGE to die down a little.