The key changes won't only be what we buy online, but where and how we buy. However, there are some problematic economic and social issues.
Security is a big issue.
A company could be based in one country with the Web server hosting its site in another while you're purchasing its products from a third country, with instructions to send them to a fourth. Progress on the regulation of e-commerce is vital if it's to be a safe and trusted form of transaction, and to ensure governments don't lose revenue. The UK government in particular is working on legislation that'll recognise the legal validity of certain kinds of electronic signature and the permitted commercial use of cryptography for transactions, while retaining or introducing rights for the police and security services to be allowed into encoded systems to combat crime. Fears might be more to do with lack of exposure to the online environment than a fundamental mistrust of the security methods used. Bodies like the Consumers Association have launched online branding schemes to boost consumer confidence in the Internet.