I'd definitely like to see these gameplay loops remain in the game in some manner, including Titans, spires, etc. It'd be an awful shame for some of the most exciting content, that's been developed over years, to simply disappear from the game. Especially considering the time and effort players have put into learning the mechanics, and then designing/building specialised ships to fill those roles.
I like the idea of the odd Titan incursion into the Bubble, but having an area of space where the Thargoids can fought reliably would be advantageous for AX pilots as well I think.