Yes a lot of bloggers including me rely on Adsense for an income. I wasn't making a living with Adsense until 5 years after starting my blog.
5 years of hard work and now I'm continuing to make enough money to live off my blog each month. But when I first began my blog I was making nothing until the first year and even then the first year was enough to buy a cup of coffee.
But after working hard all those years all that hard worked paid off and is still bringing in income.
I don't have to work as hard now but I still have to work and publish blog posts on a weekly basis to keep my blog fresh and keep google rankings up and get google search traffic.