Similar to humans, Bitcoin grows in value according to degree of faith placed in them. It's the same mechanism that gives Trump power and keeps minorities/women out of tech.

The two main forces that give Bitcoin more faith power than others are its age and how well known it is. The attack surface is small because of its simplicity.

I doubt the smart contract systems will be valuable until they build up a body of vetted (by time) law like Deleware has for startups.