This is the most important factor: managing expectations. This is where I see challenges for the KA, or any new widget for trying to make inroads. Setting those expectations, but at the same time they can be a big guess due to a lack of real world competition testing. On the other hand, the initial sales pitch is often exaggerated (80 hours?), leaving people pissed off and feeling mislead.
Extreme example of managing expectations: F100 in the U.K. Arguably the largest grids in the UK yet the highest maintenance motor in existence for karting. They made the value proposition clear, while also being very transparent about how much work is involved to take part.
If you don't have a decent value proposition or differentiator along with a marketing plan that's going to line up with reasonable expectations, you don't have a viable class/product/widget.
At this point, I'm looking hard for this with the KA, but I've yet to find it. This is by no means exclusive to the KA though, there's a lot of "snowflake" classes and so forth in karting and we need we to address that with objectivity.