The future surely holds many changes for digital marketing that are impossible to predict.
However, one thing is clear- people are losing trust in the internet.
There have been a number of recent scandals that have caused people to lose trust in the Internet.
Google, the most popular search engine, was the subject of 2 recent news stories-
For a better understanding of the impact of search results on politics, here is a general research paper that deals with the subject-
Examples Include:

As a result of all these scandals, trust will continue to become a more important issue. Therefore, companies need to prioritize trust building factors. This includes branding and verifiable good recommendations.
Social Media recommendations from friends will also gain currency. As well as tools that can verify recommendations as not being manipulative.