Quite the contrary, KiCad is constantly improving and getting better with each release. When did your Altium last crash? I bet it wasn't more than a week ago.

To quote a colleague: "Altium is used by those who are forced to do so"

The real reason why companies are invested so much in it, because they have knowledge in it and huge design libraries.

Now offering a way to convert those properly to KiCad and giving support for edge-cases, that would be a business opportunity.