I'm not really following the logic behind the recently presented propaganda - the one portraying that this is some choice between having ads or embedded mining.
It's pretty apparent that both will be utilized concurrently.
Probably a better thread for this, but I'll look later.
Edit: actually upon realizing that the miner stuff may be steganographically embedded, I'd probably expect that the well-to-do ad server would spearhead the efforts to adopt browser mining, and ultimately one technology will simply absorb the other.