Ew Gundam. Well, at least I won't be staying up that late.
Anyway, it looks like HxH isn't the only show that's winding down, I didn't notice until now that The Promised Neverland is also reaching the end, with the last episode airing next week. Even beyond that, a lot of shows seem to be wrapping up. Here's some of the current shows that are set to run out of episodes (not counting off weeks, so some of these dates are probably going to be later):
My Hero Academia- August 17, 2019
Dragon Ball Super- October 5, 2019
Attack on Titan- July 27, 2019
The Promised Neverland- June 29, 2019
Sword Art Online: Alicization- July 13, 2019
It might just be because we've had a lot of long running shows like MHA, HxH, JoJo, and Black Clover lately, but this is a lot of turnover in the lineup, so we could be seeing multiple new shows pop up soon. However, there's a few considerations to be made here:
-MHA, The Promised Neverland, and SAO: Alicization have unaired episodes still in production (MHA and TPN are getting new seasons, while SAO is on hiatus). So they may go on break for a bit but they'll probably come back later.
-Jojo, One Punch Man, and Mob Psycho 100 have new seasons that haven't aired on Toonami yet. One or more of them could fill the vacant slots.
-Dragon Ball Super and MHA are both EXTREMELY popular. Even if they run out of new episodes they could still potentially rerun them and still get good ratings.
But yeah, we could be seeing multiple new shows soon.