I remember people arguing the Wii wouldn't be able to run it when it was brought up as a perfect fit for Wii controls.
If the original Xbox could do a decent version of Half-Life 2 and Doom 3 then the Wii could have done Portal. No one would have bought it though.
Yep, lesson of the day here is:
If anyone tells you a port of a game isn't technically possible, then they're a dirty liar. The real answer is "There isn't a justifiable business case to do this port, because we won't get enough of an ROI to justify the work behind it.".