Not that many individual dwellings are architecturally significant on their own though – Frank Lloyd Wrights and Corbusier’s some of Arts and Crafts stuff (Mackintosh – your chap from Glasgow School of Art). It’s not a great example to compare them to wacking great public buildings that cost (or would today) many millions of pounds.
It’s just a house in the same way that the Georgian terraces are just “houses” whether it is architecturally significant or not in 50 years is up to posterity, it may be lauded as a perfect example of early 21st century design, who knows, probably won’t though. My original point is that an architect can’t design anything to be architecturally significant in 50 years, they just have to design something for the now. When Frank Lloyd Wright did his prairie houses he wasn’t designing them to be “architecturally significant” for the future.