I don't get the point. Ad-blockers are available for Android and most non-tech people don't even know that ad-blockers exist. So for the large majority, nothing will change unless Apple ships with ad-blocking on by default (which they won't).

I also think that blocking ads is everyones right just as it's your right to record stuff on TV and filter/fast-forward ads. If business models based on advertisement don't work out anymore because of blockers (which i highly doubt), companies will adapt and start monetising their content in another way.

Apples search integration is a different story, though.