Every change will be met by other changes, ultimately leading to an equilibrium. A single change can not continue with its trend, as long it is connected with an ecosystem. It must make deals and find a balance.

In this case, the organic content will lose against the invading crawlers, either way. If they build a fort against the bots, they go undergound and remain unseen by their customers. If they don't mind bots, bot summaries would become those forts, with the same effect.

So ultimately the websites have to realize that bots are the only customers they can expect. Humans are long gone, as no human would ever need to click a link, if they are fed with the summary walls.

To realize this, start a blog and see how tough it is to get any meaningful attention to your great content.