Having large groups of content that all revolve around the same topic will build more relevance around keywords that you're trying to rank for within these topics, and it makes it much easier for Google to associate your content with specific topics. Not only that, but it makes it much easier to interlink between your content, pushing more internal links through your website.
When the topic of SEO vs SEM arises, some experts may argue that SEO is the best way to go as it offers higher quality leads at a cheaper cost when compared to SEM. However, it isn’t so simple. Every business is different and has unique needs. For example, your small business may not have a big ad budget and it may also lack the resources needed for doing effective SEO.
The position of a link on a search results page is important. Depending on the search term, organic search results often make up only a small portion of the page. Since ads are at the top of the results page, on a device with a relatively small display -- such as a notebook, tablet or smartphone -- the visible organic search results may consist of only one or two items.
The piece on generating demand for branded queries rather than just product-based ones is particularly interesting here. It sounds as though it'll be more important than ever to have a strong brand in order to succeed (rather than just having a well-optimized site -- and ideally, having the strategic, technical, and creative sides all working together cohesively). Perhaps it's possible that brand exposure through things like answer boxes can still deliver some value too, even if it's difficult to measure, and CTRs are diminished?
Organic is different. Matching keywords to user intent means you may be present in many searches. The user may find you consistently, and once they get to your site, they are more likely to stay. Organic users are still your best long-term customers. In my experience, they have lower bounce rates and more pages visited, and they are more likely to return.