Well, there's still some x86-32 around (some not too old Atoms), and armv6 (Raspberry Pi). And I'm hoping OpenRISC or RISC-V will be successful eventually.

I don't really get the point about how open software lost. Sure the hardware is disposable, but consider that the amd64 platform is only a relatively minor modification of the x86-32 platform, and that has only seen relatively small changes since the 386 - which is what the first linux was based on 24 years ago. The 32 bit arm architecture, just like the 386, came out in the mid eighties.