Google shapes the way many people discover, use and keep information (google search, maps, news, finance, gmail, etc). To let Reader languish then kill it because "usage has declined" is rather self-fulfilling. I bet if they didn't update their satellite images and road data, Maps usage would decline as well.
They could have been working with the community to define new standards - tags, markup, etc - to allow richer interaction between rss readers and sites (thinking geoloc micro format work, and other semantic markup work in recent years). Making 'reader' a first-class citizen in its suite of services, then using interaction data as more relevance signaling seems like an evolutionary step that only a handful of players the size of google can make good use of, but apparently in their infinite wisdom, they'll just shutter it.
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