Overdrive gave them something better than what they ever had, and then took it away. The libraries aren't left off worse than before.
Personally, I always search using the library catalog's web site, so this whole article is about a feature I never saw. I would encourage everyone search that way instead of directly on Overdrive.
I haven't looked up the numbers recently, but after a spike in ebook usage several years ago, the percentage dropped and I suspect continues to do so. Most people are over the hype and have returned to physical book usage.