Should society care if a given company dies?
It seems like in general we should only care about the economy in toto.
Companies die all of the time in the constant process of ground truthing and the economy swarming to find good ideas.
One argument for wanting longer-lived companies is that companies that know they won't be around for long won't think about externalities at all and just extract.
Companies around for longer have to think about the indirect effects of their actions because they will swing back and affect them in their lifetime.