I think that "we're not going to patch it because it's no longer supported" excuse might need a little regulating in the future when it comes to infrastructure / network equipment, especially if it comes on a device that is in wide use and could lead to potential harm (e.g. botnet, etc.).
In some specific scenarios that could be akin to a car manufacturer claiming the same when a major defect is found .. "yeah, but we're not going to recall or fix it because it's out of support."