I was an architecture undergrad myself and immediately moved to the web upon graduating a few years ago. Thing is, I would still highly recommend it is as a major (...at least, the program I was in -- definitely varies school to school). My experience was of four years of mixed media problem solving through models, mylar, computer animation (Flash/Actionscript/Maya), etc. Definitely shaped how I think/approach everything I work on.

If I had a startup that was looking to hire innovative UX/design people right now, ex-Archs would be towards the top of my list.