Actually, everyone is in love with steam machines currently.
Who? Are you talking about the steam deck? That thing won't even sell 10% of the amount of consoles that the last placed xbox sells this generation. It probably won't even sell half as many consoles as the xbox will sell in its worst year.
People don't care about steam machines, they just like steam the digital distribution game platform.
No one knows because Valve hasn't released sales numbers and I'm not sure what number you would expect me to say that would satisfy whatever you arbitrarily consider a successful product.