In my circles, which admittedly may not be representative, RSS is/was a tool for people whose job it was in part to proactively ferret out a wide range of information and insights from obscure corners of the internet--so journalists, analysts, and the like. Which just doesn't describe a mainstream audience.

While it's satisfying to blame Google, the killing of Reader always seemed like a natural effect of RSS not being popular than its cause. It's not like there aren't other RSS alternatives. And, of course, social media does a pretty good job--for all its faults--of surfacing those various tidbits with or without RSS.