Not worried. I’ve owned only ARC amps and pre-amps since ‘87. I currently own a Ref75SE and a LS28SE. I’ve always had an excellent (albeit expensive) experiences with ARC service and ARC authorized service centers.
I think it’s very likely that they will continue in some form or another. I might not buy any more gear from them but there’s a lot of money to be made on the service side. I’m confident that service will continue even if it’s only by the authorized service centers.
Anyone who is selling their ARC gear on this news probably did the same with their 401k when the marked tanked. Patience is a virtue.