Are PURLs becoming ‘has been’ technology?

Today I was asked this question by a potential client.  Thought it was interesting.

Q: Are PURLs becoming ‘has been’ technology?

A: “The only technology that I see overtaking PURLs would be QR Codes.  They have had some success in Japan, but its going to be a while before it is commonplace here in the states.  People will not only have to have the right technology in their hands, but they will also have to know how to use it.  So I think PURLs will be around for a while as the primary medium to track offline marketing efforts.”

Thoughts?