I think it always depands of the company´s philosophy. Since Kemper is the same company as access i would not worry much about it. The first generation of the virus sythesizer is from 1997. Even the old models still get firmware updates and can be serviced.
+1 Many big companies intentionally design electric products with a short planned lifespan so new models can be sold frequently for profit (bad for the environment). Perfectly working printers that fail after a pre-determined short number of prints secretly decided by the company is a classic case.
They have designed the Access Virus synth models for longevity in mind and I think they really aim for this with the Kemper as well.
They might already have a big spare part storage for times when some components no longer are made. It might also be designed to be able to be compatible with new updated components when repaired, even when they release additional kemper products in the future. Also sound/profile compatability between products is something I think they aim for.