"... it's unlikely that the commercial entity will vanish overnight ..."
You're wrong on that score. Places that I've worked at have seen vendors or their products suddenly disappear. A couple of examples. A pub-sub event system disappeared because a large dot com bought the vendor specifically for that product, made it solely for their internal use and suspended all existing licenses. In another case, the vendor was bought by a competitor and the new owners dropped one of the aquisition's products in favour of their own much more expensive, incompatible and less featured one.
Biting the hand that feeds IT
