@sundogplanets @steter yep, you can't beat the speed of light. Lower orbits give lower latency, higher orbits give higher latency. People demanding shorter delays will keep paying for those lower orbits.
Using balloon-lofted relays seemed like a pretty good idea, but you can't rely on them in warzones. And they probably can't stay aloft for decades at a time either. There's really not a lot of great alternatives, if you want wide coverage and low latency.