Blame me. I was parasitized by image from total recall tv show, (which was out after fallout), that had some very fallout like images.
My deepest apologies to you sir, for having been smug without being able to afford it!
But then I don't see fallout being that much inspired by blade runner, despite the obvious .223, that was an easter egg weapon of fallout 1. Whats so 80's orientalism about fallout? Aradesh, maybe? But that's all. A fallout with a high Blade runner inspiration would have been more cyberpunk-like.
The architecture of the game is much more inspired by Gotham city than anything else and a lot of other element as well (the jumpsuits, the hulk, the nuclear paranoia/propaganda posters etc, etc...)
http://www.designcommunity.com/scrapbook/images/1139.jpg
But I am going to watch Blade tonight to check exactly the streets levels.
Point is, Fallout is 50's not 70's or 80's. There might be some element from other era, bixing too much different genre would dissolve fallout's identity.
As for the retro aspect of blade runner, i guess it comes from the use of elements from the film noir, that had its golden age in the 50's, not specifically from the esthetic of the film.