I recently read a review of a new business plane that had a similar
feature. I think it was the new Gulfstream, the reviewer noted that
the pilot manually partially depressed the cabin. Once the cabin alt
was above some figure like 9,000 or so, the plane automatically
initiated an autopilot descent to a 'safe' oxygen altitude.

A large scale accident like this may be responsible for an FAA mandate
that such systems be retrofitted onto existing commercial fleets. If
you know a public traded company that makes such equipment, now might
be a good time to invest.