I've been thinking about this alot lately.

Yes, I think you're right about trust being what is next, to large extent. Right now Amazon has a monopoly on trust and very easy payments. I think OpenBazzar or a decentralized market could compete, with companies of trust being faciliators on such a decentralized marketplace. Amazon, Apple, Google, eBay or any company/user could become facilitators and sell their trust to merchants. They may even create web access points (like steemit.com) to the decentralized marketplace. That way Amazon is selling their amazing trust,tools and facilities instead of running the marketplace themselves.

I thought about contacting eBay and convincing them to create such a decentralized marketplace and/or working with OpenBazzar.

If I were important or had money, I might create a start-up based upon these very ideas.