This patch would only be released should the company goes belly up. No one would lose anything.
Which is great in theory, except many companies mistakenly think they are invincible, so won't feel the immediate need for such a thing. The 'powers that be' in a larger company tend to be even more in denial about their potential fallability...
Not to mention that they may even be against creating such a patch in principal, to ensure that it won't leak to the general public while the company exists, potentially damaging their revenue stream.
A company can go from doing great to being bankrupt in a *very* short time should a major investor decide to pull out at the wrong time.
It certainly wouldn't be the first time that employees for a company show up for work on monday morning to find out that the company no longer exists. sure, in a perfect world there will always be a contingency plan to ensure that the customers don't get screwed over after the company goes down, but in reality I'm afraid you can't count on that...