What were the reason for the outages? If it is directly caused by lax testing and deployment practices, then yes what you are proposing makes sense.

But you said they were trying to keep the lights on. This reads like they were mostly doing bug fixes. They were not deploying new functionality? If that is the case, it means you got suckered into being a scape goat for a piece of ancient tech that no one cared about until it blew up. Your team are already looking for other jobs.