I'm a long-time happy ARC customer (going back to the D76A era) but I am not at all convinced that ARC's troubles are over. As far as I can tell, it still has an enormous repair backlog. The "store" link on its website has been dead for years and its product line has been steadily shrinking (no Ref DAC, no CD player). Its only "new" product introduction is an amplifier that was to have been available a year ago and it isn't clear that the company has any in-house talent to develop anything else.
I wish ARC the best. I'm a nut-job, so I'm actually considering buying a new Ref 6SE, in part because I believe it will be serviceable regardless of ARC's future. I think ARC is doing its best to overcome its issues and that only time will tell whether it succeeds.