Why do you think they are going down? My impression is that their prices are actually good. Especially for CM4 compatible alternatives. They fab in China just like everybody else. Although they do some or all assembly (soldering) in UK I think.
My understanding is that Raspberry Pi differentiates itself primarily with software support, which is hard to duplicate trivially like a physical device.
Sad to see industry pioneers lose to players that copy them and undercut prices using cheap labor.