There's at least one new city there, but I don't think it could handle all of the departed colonies coming back. There's not enough land that can be lived on or farmed to support that many people. Besides, it's been long enough by now that most of the people living in the colonies never lived on Earth themselves, or only barely remember it.
[Basically anyone under 50 isn't going to have lived on Earth, and definitely isn't going to remember how it was before it was razed.]
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[Basically anyone under 50 isn't going to have lived on Earth, and definitely isn't going to remember how it was before it was razed.]