My assumption, based on how these things have gone in the past, is that this is it for Wax Works and Origins: The Curse of Calico. Both are entering their fifth year, which is typically how long Knott's runs a maze before 86ing it. Not sure if Curse of Calico will be exempt from this because it's a lore-heavy house (Trick 'r Treat ran in some form for seven years).Wax Works will most likely see it's last year this season. Bloodline needs some work for sure. It's never quite hit for me.
Of course, we don't know if they'll stay at 10 mazes this year. Prior to last year, Knott's hadn't had more than 9 mazes since 2015 (when it had 11). The high watermark is 2007-12 when they had a staggering 13 mazes every year. I have no idea how they staffed those mazes.