Whole I agree that would be fun, I would absolutely hate to see the price of that event. I’m not even sure how optics would work with staffing at all three locations. Plus, 17 houses (which is the low end of your proposal) would feel like way too many. We’ll see how 11 or 12 go this year (if that rumor is true). But I feel like it would be one of those situations where quality would fall to try to meet that much demand.
In my opinion at least, there have been at least 2 the past few years that weren’t quality in my opinion. I would wonder what the quality would look like at 17. 22 (The high end of your proposal) would need at least 3-4 night to hit each house once. Express would be extremely expensive too.
But all of that to say, I do agree it would be a lot of fun. Maybe make each park its own little mini theme with an overarching theme to tie them all together.