KT will have a place at club racing and regional racing for years because it’s so engrained into American karting.
The KA has proven to be damn reliable. @Honeybagel gave some numbers on his experience with KA rebuild times here: IAME KA100 Maintenance and Rebuild Time
I would mostly agree with him. We have been doing about one top-end rebuild a season for the past two years. The clutch is bulletproof and maintenance-free basically. I haven’t touched mine in two seasons.
I would say if you have a KT setup right now, hold onto it and keep racing it as long as you can until you need to move up or the KA really establishes itself as a long-term package. Right now I can’t see any reason KA would go away, and it just keeps getting stronger. I think having it at SuperNats this year was a good move to grow the class, and I think the super close racing it provided, as well as the great user experience and lack of maintenance was showcased to a whole new group of people.