● Collect conversion related data from your PPC campaign and use it to convert your organic search visitors better. Also, keywords that worked for you in PPC are best to optimize your website for, so using them for SEO purposes makes sense. Your PPC campaign will end, but the rankings you achieve for the same keyword will remain for quite some time.
What you are in fact talking about, are Google's death stars like the Shopping box, Knowledge Graph etc. It's fully understandable why many SEOs can't stand them 'cause whole categories of websites (price comparison platforms, for instance) have already fallen victim of such death stars, and there will be certainly numerous other portals, which will lose almost all of their traffic in the near future. Despite your (quite good) suggestions on how to circumvent such an issue, the situation for such an endangered portal can be hopeless when it's its whole business model, which a new Google feature makes obsolete. See geizhals.at for a very famous example.
Awareness and Branding. Visibility is one thing and being top of the line is another. The more that people see you, the higher your chances of being remembered and that keeps awareness among potential customers. Same goes with branding. Once you start linking your business with certain terms and keywords which are deemed positive for you, its effect will most likely be beneficial for your business and can, later on, lead to a sale.