While I totally understand your concern, I still think you're jumping the gun a bit. I saw just from last year's thread that a couple people stated they were accepted off the waitlist in July. I didn't even bother at looking at posts from June from the 2018-2019 thread. We are still ONLY halfway through June. Keep that hope alive! Of course, I'm not privy to the details of your waitlist situation so to each their own on the level of optimism about getting in off a waitlist at this point in the cycle.
That being said, I'm definitely considering submitting my primary applications in the middle to end of July. I didn't submit primaries for AACOMAS until mid November last year so I definitely want to be on the earlier side this upcoming cycle in the worst case scenario. I'll likely be reaching out to the schools I'm waitlisted one last time in July to try and get an update on movement.