Agreed. I doubt we'll see interstellar travel until we can affordably make a bunch of sealed tunnels in an asteroid, get it spinning for artificial gravity and turn it into a self-sustaining colony.

Then we'd need to figure out the best way to propel it, and to where, and oh yeah, find a bunch of people who are willing to live the rest of their lives on it and raise a second generation (with an unknown future) there. It would take a lot for that all to come together, and any other plan you could currently devise would probably require fictional technology.