It does seem like there are fewer chair kits than before. Whether it's because they were built for self-inflating pads or because air pads are getting more fragile, fold-out chairs with frames do seem to be more popular. I don't see why, though. The most popular ones only seem to get you 6" off the ground and they don't have much back support and no insulation.

Sitting on the ground to cook and reading under the tarp are my main use cases. I can't do that stuff in a chair that raises me off the ground, so a chair kit makes the most sense for me so I'm glad I grabbed one while they last.