Not so much failed as it was never a real thing in the first place. Valve supported steam machines and linux gaming so they could fend off Microsoft's attempts

Not so much failed as it was never a real thing in the first place. Valve supported steam machines and linux gaming so they could fend off Microsoft's attempts to monopolize all gaming with proprietary executable formats like in the windows store. Every time MS starts this up again Valve will wave around the linux/steam machine flag until it stops and then they go back to not caring about linux.