The future of space travel is mining the asteroid belt and war preparation, anything else is just farting around, without the unobtanium or the fear of death to drive us, there is no reason to leave earth for more than a quick trip.
If Elon Musk wants a base on mars, have him start putting missile silos up there, there will be a McDonalds up there in 30 years instead of some decrepit shack with a few science projects going on.
Space is just a place. All that it takes is people who want to go there and the technology to do so being within their grasp. As technology advances and people grow wealthier colonization of space will become possible, and then it will happen. And once there are people living in space then the entire equation changes again, because once there is an economy in space there will be more reasons to go than just adventure.
Edit: In terms of technology/wealth, imagine a future in, say, 2100 when we have mastered things like automation, 3D printing, etc. When we can fill out a form on a web app, upload a few files and not just have, say, a fully reusable rocket ship pop out the end of a factory but actually a rocket ship producing factory pop out. Such things are technologically possible, and within our grasp. What happens when we have such power? Do we sit at home?
2100?? having those things in 2100 would mean we humans all are incredibly lazy. You already have 3D printers. Automation too. Why you need to wait 88 more years?
Given what happened in last 30 years, I would rather say in 2100 you will be able to scan yourself into a readable file and shoot it across the solar system all the way to the Mars, and print yourself out anew (printing algorithm would catch and get a rid of all cancers you caught and aging too).
If Elon Musk wants a base on mars, have him start putting missile silos up there, there will be a McDonalds up there in 30 years instead of some decrepit shack with a few science projects going on.