I look at it like this. Does anybody complain that a 68 marshall plexi tone is "outdated" and needs to be upgraded? (Well there may be some) Or a 57 twin isn't any good anymore because there are newer amps that do this or that?
I have played both of those aforementioned amps and can tell you good tone is good tone. I can make my Kemper sound just as good if not better than those amps so how can that be "improved"? It already has, it's called a Kemper profiler. If you have something that sounds indistinguishable from the original what is the need for a shiny new thing? I have a Kemper with a 68 plexi and 57 twin built in. If I want something else I can have it too. Sound wise, a Kemper can never become outdated any more than a vintage amp collection would.