You say that like it's a bad thing. If a piece of content or a given website cannot survive without ads propping it up, was it ever worth anything in the first place? Ads are far from the only revenue-generating method available nowadays, they're just the easiest/laziest.
When online advertising-as-we-know-it finally chokes to death under a mountain of its own waste, maybe we'll see a drop in blatant linkbait lowest-common-denominator garbage that drives up the S/N ratio. There may be less content overall, but I suspect the content that survives will be much higher quality as a result.
Not that I particularly care which way things go, I run adblockers on all of my machines from a security standpoint as much as anything else.