Should users be able to adjust a UI design to their preference?

After I read the following post, it sparked an even deeper thought.

From the Terminally Incoherent Blog:

Should people adapt to computers?
"There seems to be an interesting argument going lately. The topic that spurs this discussions is: “Should we expect people to adapt to complex user interfaces, or rather adapt user interfaces so that they are easy for people to use?”

I believe we need to ask a slightly different question regarding the future of online user experience design.

Just like our freedom to select a favorite Web browser or RSS reader, perhaps the future of Web 2.0 interaction design will allow users to remap any application or Website to their preferred GUI.

Today, content can be separated from form – XML and RSS, for example. Websites and various applications can parse this information and format it according to its own layout and UI standards.

What if UI design for 2.0 applications became standardized? Better yet, what if users demanded that a design adjust dynamically to their preferred layout? We already see a similar approach with customization options in everyday Web browsers, music players, and operating systems.

If we openly allow users to adjust the UI design we provide, are we removing the unique branded "soul" of applications and sites we build? Or would we be enhancing the experience by letting users to modify our designs to a consistent method they are familiar with?

This new demand could open an opportunity for certain brands to gain more market share. Companies focused on building great user experiences, such as Virgin, could provide a branded "standardized skin" that offers superior information management within a visually-rich online environment.