Kemper is not dead, but their popularity, no matter how you measure it, has suffered in recent years.
The bottom line is they lack the options their competitors have to improve their standing in the market. Every other modeler can easily add new features in firmware updates or come out with a next gen product. Kemper does not have those options.
Their design is basically unchangeable, so they are limited to only minor updates in their firmware (which usually take years to develop) and they will never have a next gen product.