using olinks everywhere?

I have a large collection of user guides in Docbook 4.3 and 5.1, and 
they have a top-level Docbook files with a <book> element, and 
sub-chapters are pulled in using xincludes like this:

<book id="book_1" lang="en" xmlns:xi="http://www.w3.org/2001/XInclude">
     <bookinfo>
         <title>my title</title>
     </bookinfo>

     <xi:include href="overview.xml"/>
     <xi:include href="platform.xml"/>
     <xi:include href="components.xml"/>
     <xi:include href="install.xml"/>
etc.

In the interests of simplicity for authors, we have the idea of using 
only <olink>s for linking across these books. Does anyone know of any 
problems with using only olinks?

Thanks,
Mark