I suppose, but that's a highly variable statement to make. Undoubtedly, there are many websites that could be reduced to static equivalents, but as I deal in web applications, that's kind of a tough pill to swallow.
With apps, even if I build a single-page app, I have to build an API to power it, and that API needs to know the difference between "customers" and "customers/customer_id", and the easiest logical way to manage that is through URL routing.
Even in static apps, URL routing is kind of a burden, unless you never link to internal pages and never grow your content beyond what you can keep in your head.