Which could theoretically be done today but then you'd be a tenant of Musk. I really think the idea of mesh networks is great for neighborhoods but can it be extended to a global-scale network (well ... continent scale until there's a personal communication mechanism that will cross oceans)?
You can theoretically run a very low bandwidth set of links over any radio technology, including HF which will give you that long range connectivity.
Problem is, people expect streaming video on their smartphones. You can't do that over low bandwidth over the horizon links.
Continent scale? Depends on the continent. No way to do that in the Americas, there's just too much open space. You could do it in many cities I do think.
I imagine there are no upper bounds to the growth of satellite communication capabilities other than physical limits. Extrapolating a few decades at current growth rates out the network be enormous.
