Let's let all that "content" that is solely ad-fueled die, and we'll see what's left?
See, because I think that's pure bullshit. No, let me amend that: it's bullshit for all the content that's worth seeing.
Because, see, anyone that SELLS anything is going to see the value in connecting to customers more easily and conveniently - ergo, those sites will pay for themselves.
All the hobby sites, where Billy & friends post their dungeons and dragons house rules, well, they'll still do it because they love it.
Media sites, like say popularmechanics.com, etc have the implicit 'trade' that is the same as their physical publication: enjoy our content, and we'll trade your viewership eyeballs for ad revenue. No problem there.
The bulk of the rest of sites "fueled by ads" are none of these. ehow? Fucking worthless. Ads shoveled to me on amazon? Ebay? BN.com? I'll block those, because I'm already paying them for a service in the price of the goods; if they can't support their mechanisms on that, then too bad, they die. (I suspect that they can, and ad-revenue is just another profit-mechanism.) Huffpost? Fuck off, I'd rather read my news from actual news organizations than some shitty aggregator reposting crap.
So no, I think the things that I "need" from the web already have payment mechanisms built into their models. The rest either are labors of love or can die, and I rather suspect we'll be better off.