The idea of the Hurd is that any user is able to run whatever server they want - GNU has been concentrating on microkernels not because it's the new hotness but

The idea of the Hurd is that any user is able to run whatever server they want - GNU has been concentrating on microkernels not because it's the new hotness but because they believe it's good architecture for more openness. So presumably in this hypothetical case you'd be able to upload and run whatever additional servers you needed on the WDTV. You might say "but they might make it impossible to login and do that", but they could have done the same under Linux just by not running sshd - however they didn't.