IF something like that were to happen I surmise we can reasonably expect some sort of announcement/warning to the approved API partners (and probably even to the general public). I would say it’s almost impossible they’ll push through some sort of update that suppresses auto-pinned content without us knowing (at least a little) ahead of time, thus giving us time to adjust accordingly.
A blog itself isn't really a business—it's more of a platform for other income streams. Your content alone won't likely make you money. Instead, you'll have to get advertisers, sell services like consulting or speaking, use affiliate marketing to get a percentage of sales from links people click on your blog, or maybe offer products like ebooks or premium content to actually generate income. ProBlogger has an excellent post about these different ways you can make money.
Make it easy for readers to browse – If you want more pageviews, you should make it as easy as possible for readers to read your other blog posts. You will want to make it easy for readers to find your blog homepage, categories, tags, search bar, and so on. Also, I recommend including links in every single one of your blog posts, so readers can easily find related topics.