As architects we are mostly working on translating business models and goals to IT strategies, plans and designs. We accept the business model as it is, and work from there.
Business models however, are not immune to IT changes. This blogpost, Amazon and the reintermediation of the spectacle, is a nice illustration of the fact that business models are impacted by software. This means that architects should understand technological progress, be able to determine what the impact will be on business models, and be able to help organisations understand how IT impacts their business model.
I personally really like this part of working in IT, understanding new technology and thinking about it will impact businesses and customers.