I think this is pretty insightful, especially since many web sites have already started to go down this road: one example is ultimate-guitar.com, usually the top Google result when searching "<song title> chords".

If you enter their site on iPad or iPhone, they display the chords but pop up an ad for their native app (which is limited as a free version) that is nearly impossible to click away and often automatically redirects to the App Store. It is infuriating to see the results I want underneath an ad but not be able to reach it.

I fear ad blocking will cause this effect to be all the more stronger rather than weaker: sites will entirely move away from displaying content to users on iOS and will force users to download their app.

The thing is that most users will become angry with the individual sites, but very few will put any blame on Apple themselves...so it really is a pretty brilliant evil plan on Apple's part.