I don't understand why people are so focused on Facebook's ad revenue and it's supposed unsustainability, since Google has been around longer, are way bigger, a

I don't understand why people are so focused on Facebook's ad revenue and it's supposed unsustainability, since Google has been around longer, are way bigger, and you know what? The overwhelming majority of their income is also from online ads. And you know what? Before that we had TV, Radio, and newspaper ads. Those industries didn't implode (or start to) until better ad delivery systems (the web) showed up? So you know what's going to kill Facebook (and google)? Not some realization ads "aren't working". A newer and even better ad delivery system. (also unlike old media, there doesn't yet seem to be a reason to say FB or google won't be behind this new system either). This is tired old bollocks.