The amount of money you can earn from blogging depends on the niche you're blogging in, how hard you are willing to work on your blog and what methods you use to monetize your blog.
There's many bloggers who have worked on there blogs for a decade or longer and are making $10,000.00 a month or more through Adsense, Affiliate products or services or selling E books and courses on how to do what they're doing.
You certainly can earn a living from a blog if you're willing to work hard at it.