Not so long ago you could have included Dacor in that list. Any one of these companies could go bellie up tomorrow. But you make a valid point none the less....Thirty year-old Scubapros, Aqualungs, Sherwoods, and Oceanics are still being serviced. I am not sure you can say the same about Sea Elite.
If I get a new reulator it will most likely be a Sherwood Oasis/Brute or one of the Oceanic Neo combos. I had a Sherwood Magnum Oasis before I got my Dacor and loved it.
Another valid point.Even if the allegations are true, a rebreather is a much more complicated piece of equipment than a open circuit regulator. Also remember that most scuba manufacturers have had to recall equipment even top of the line companies like Scubapro and Halcyon.