[oneplane]

Ecosystem does not mean maker/thinkerer mindshare in this case. It means hardware, I/O, software, firmware and available knowledge from the board perspective, and active distro integration from a software perspective. There are enough people and there is enough momentum to build and maintain multiple software distributions for the Pi (and it's BCM SoC), as well as upstream patches and maintain those. Even in the commercial space you will not find such well supported boards.

This does not mean that other boards won't work or won't have a place, but are highly unlikely to cover the same global space the Pi does.