Delivering even 30-100Mbps to half a million customers all over the world is no mean feat. Complaining that your speeds dip below 100Mbps on a unmetred low latancy satellite connection is just pathological. Most of the world do not have access to this speed on fixed line networks. You can't get these speeds with even VDSL.. Fttp and cable are the only fixed technologies beating a satellite. Have a think about that.
That works out at several terabits of traffic at peak times. I think they should be able to make good improvements with more ground stations and inter satalite links even if they never launch another satellite.