Yeah, I saw that Nanoblock model come out earlier this year. It was okay, but a little disappointing (like most knock-off blocks are.)
I think the Chrysler building would make a great Architecture set, as well as the Sydney Opera House, as many have been speculating, though I'd rather see the Opera House on a larger scale, like the Taj. The Golden Gate Bridge would also be neat.
I'd like to see a lot more non-US landmarks, though. A cathedral in Europe would be beautiful - or something like Basilica Sacre Coeur in Paris, France. Or how about a landmark from southeast Asia? There are a lot of gorgeous shinto shrines in Japan (as well as other beautiful architecture.)
My biggest issue with a bunch of the architecture sets is the relatively low part count for the price point. I know licensing can be an issue (in the case of the Frank Lloyd Wright designs), but I'm happy to pay for a higher price point, so long as the parts and design are worth it!