OK, if a He3 reactor comes online - fine, let's mine the moon. But we sure as hell can't live there, it has 1/6th the gravity of earth. Human beings are not adapted to 1/6G, we are adapted to 1G. If there is material on the moon worth mining, then people won't do it - machines will. We can make machines that would work in 1/6G far easier than we could adapt ourselves to live in 1/6G.
The moon is a canard. As is living on Mars.
I predict that within 500 years humanity will have spread throughout the solar system. But we won't live on a single planet or planetoid. Nor will we "teraform" any planets or moons in our solar system. We will instead *build* our habitats and live within them in orbit around various planets and moons which have materials we happen to need.
I could imagine a large rotating space station in orbit around Titan, dropping a nanotube straw to the methane atmosphere and/or oceans for energy. Or we might live in orbit around Earth, Venus, or Mercury in order to extract abundant sunlight for energy conversion.
Once we get off of Earth's gravity well, why in God's name would we build another society within another gravity well? Space is where we should live. And in space, we should build habitats suitable to our evolutionary history. And once we can do that, the notion that we waste our time looking for "habitable planets" becomes a canard. Our only interest is to look for stars and planets with enough energy to support our biological needs.