Sites that don't employ this don't risk falling in their rankings. This added data allows for richer snippets (which absolutely increase clickthrough ratio), but that won't directly make you rank higher (or lower it their absence).

If your website employs an SEO or webstandardista, you should already have your sites marked up with metadata. Reviews and rich breadcrumbs etc. have been around and supported for years now.

I suppose that since Google wants to solve these problems algorithmically first and foremost, that many of these structures already get recognized. Right now you don't _have_ to mark-up your breadcrumbs, for them to still appear as rich snippets on your search result listing. Google recognized the structure without added mark-up.

For now, I will build the new types in my CMS like a good web developer. That won't cost me any time in the future, and now I'll have a way to separate myself from those that won't add schema's or metadata to their mark-up. So, at the end of the day, I just got more expensive :)