Right, because TW2 was developed simultaneously for PC and 360, and CDPR had the same resources at the time that they do now. If only it wasn't for the bad, bad, evil CONSOLIZATIONIFICATIONMENT of everything, TW2 could've easily been the size of TW3, but alas.
Or maybe, out here in the real world, the 360 port came after. Maybe the 360 port was still a visual marvel for that console's standards, but it had been noticeably downgraded from the PC version, not just in overall visual fidelity, but also with added doors to break down Flotsam, the removal of music tracks and the audible compression of voice files. Maybe the controls and interface of the 360 version are actually different from the PC version. Maybe CDPR made a ton of money, partially because of the 360 version of TW2, and that's why they now have the resources to make this enormous game that we've been promised, the game that, it seems, they've always wanted to make. Maybe that's what really happened, so maybe all of this is pretty much irrelevant to the question whether the PC version of TW3 will suffer because of the console versions.
Why is it irrelevant? Because the situation is completely different now. The three different versions are coming out simultaneously, and none of us here really knows what that means for their development. Of course it's not unheard of for PC versions of cross-platform games to be castrated for the sake of easier ports to last-gen consoles, but maybe porting is easier to do now because the PS4/X1 are basically mid-range PCs, so I could feasibly see the game just running at medium settings on consoles. What we do know is that the footage that was shown at E3 was running on PC, and that would seem to indicate to me that PC's the lead platform for development.
And besides, it's not like every cross-platform game had lo-fi visuals on the PC to accommodate the console versions. Crysis 2 and 3 still looked vastly superior on PC, and EA didn't seem to be worried that this would hurt sales of the console versions. Console-only gamers generally don't pay attention to what's happening on PC one way or the other, so it really doesn't matter.
I think at the end of the day, we can fuss about this until next spring, we won't know anyway, and as much as I trust what the CDPR guys say, we're not likely to get an honest answer about this. If the console versions don't look as good as the PC version, they're not going to come out and say, yeah, sorry console gamers, but you're buying an inferior product. That would be stupid.