I think Bing is doing well enough that Google is having to keep pushing. It has less a share than IE had at the start of the second browser war, so it's not like it can't be overcome. Then you look at smaller engines like DDG and while I'm sure they aren't big enough to be tracked at the moment, I'm also positive Google has them on their radar.
On the other hand, I haven't used it for many years and haven't heard anything good about it either.