I agree about the authorization issue. I think if Kjaerhus is out of business for good (which I sincerely hope is NOT the case), then some provision should be made to allow people who have purchased the plugins to continue to receive authorization, at least for a little while longer, with a known cut-off date, instead of this surprising blackout. Someone as talented as the Kjaerhus team should be able to cook up some sort of simple authorization program (if they don't already have one) and at least provide an email address for a year or two for final, manual authorizations. Seems like a reasonable, responsible thing to do, after you've put so many years of hard work into it.
The question specifically related to Sonar is what happens with VC64... and by extension, whatever other plugins Cakewalk licenses or inclusion with Sonar. VC64 is already NOT x64 (as well all know, it requires BitBridge) and that raises questions as to its future. I've already stopped using it since it's not x64, but I was looking forward to the next "generation" of it. But now that it appears -- at least for now -- that Kjaerhus is no longer in business, I would be concerned about updates, unless Cakewalk has the source code (which I hope they do, but for some reason I doubt). It also makes me think twice about Cakewalk's approach to licensing third-party plugins without some deeper, longer-term relationship with the developers, and some sort of protection from this type of event -- it seems like Cakewalk has different models of working with third-party developers... like in the case of Rene, he's been involved in other excellent Cakewalk plugins and I believe he is actually partially or fully employed by Cakewalk now (correct me if I'm wrong)... and I believe with Sonitus, Cakewalk actually has the source code in-house, if I'm not mistaken. However, with VC64 I get the impression it was a reskinned license only, which means we may be out of luck.
I understand such things happen, and are unfortunate. No one can predict the future. I just hope we see the Kjaerhus team back again. They clearly had something special to offer. At least, I hope all is well with their personal lives -- who knows, but sometimes "life happens" so I wish them well.