You can do 100s of mbps with a flag and a pair of binoculars...
Sorry, pet peeve: do you mean MB/s, Mb/s, or something else? Probably not the milli-bits per second (mbps) that you wrote.
That's EAN, also used by BA as the backhaul.
Sadly most planes still run on legacy systems, it's not something that's ever a priority.
Yes those are awesome
There's also an European one whose name currently escapes me which uses a custom flavor of LTE and special ground stations that also happily provides hundreds of mbps.
Capacity is primarily an issue on the legacy BGAN-based ones where you have a handful of mbps for the entire plane.