That was the new reality a decade ago. Social media apps was how you found blog posts, not RSS feeds.
I remember Reader dying and within a year finding a replacement but still moving on because the high noise-to-signal RSS simply wasn't doing it for me.
It's possible we all stopped using RSS because of Google but it's also possible we simply found replacements when prodded. Just like how us torrent obsessed pirates eventually moved on from harddrives full of MP3s to lazily curating Spotify accounts and from AVIs to Netflix. Google Reader was a far-too-early end of an era, but the fact we all didn't jump to a competitor like we did with Digg->Reddit was probably not just Google's fault.