Making money online through Adsense and other ad networks

I have come across an article today stating the pros and cons of using Google Adsense for extra income.

It discussed about what else but the good and bad sides of Adsense as source of extra income. I agree with some of the points that the author has written, while some made me a bit unsure such as one of the cons:

"The Google Adsense program does not provide residual income. So, you can’t continue to reap the reward of your hard work over and over as you do with residual income programs."

I know that with all the smart pricing effects, Scott Boulch's Death of Adsense, quick as a lightning disabling of accounts because of unexplained invalid click impressions  and mushrooming of all kinds of other contextual ad networks, Google has been facing a lot of criticisms lately. But why are there still some Joel Comm's, and Top Google whores? 

Or maybe it just depends on how one produces content for his blog or site, yeah? What made me think about this is this statement of one of the most well-known and equally well-earning bloggers earning from online ads:

What you write today has the potential to bring revenue for the rest of its online life. I'm sure the money he's talking about does not necessarily have to come from one online ad network only. But Google Adsense has become one of the most known source of this kind of income, right? Please feel free to correct me or anything.