According to the ITC, only 11.9% of the world has "Fixed broadband" aka wired internet. 30.1% in developed nations. There's a big gap, especially when the world catches up in a few years.
Good to know, but it might not be the most relevant metric? In many places, wired phone service got bypassed by cell phone service. I'd guess a lot more people have cell phones and are usually in cell phone range, so what we really want to know is coverage, cost, and quality of the data services that people already use to access the Internet, and how big a role satellite service would play in improving that.