I wasn't at Google during the reader shutdown, but after being here at 8 years, I now understand why things shut down so often.
Google has a lot of shared infra and they are always doing forced migrations and various unfunded mandates. Depending on the stack, maintaining a project at Google takes 0.5-3 people (like if a UI toolkit is turned down, you have to migrate). Plus there are infra costs.
On top of that, being on maintenance for a project like Reader, it's probably not very good for your career trajectory. The adverse effects of always going for launching/landing destroyed so much at Google.
Many engineers would love to just help maintain software like that, it just doesn't tend to work out given the incentive structures. (Plus that headcount and infra has to be attributed to some team. A person maintaining Reader means some other thing that can't be built, so there isn't an incentive for VPs either)