I might humbly suggest that digital libraries must adopt a theoretical stance. As I noted above, library science is devoid of theoretical foundations and of a knowledge-base that is relevant to the budding digital world. Archival science with its principles of uniqueness, provenance, arrangement and description, authenticity, appraisal, and its tool sets such as diplomatics, may offer us a framework for a theoretical foundation for digital libraries. [Digital preservation, archival science and methodological foundations for digital libraries. ECDL 2007 [PDF]]
Libraries are not ends in themselves, but serve the interests of the organizations of which they are a part. As university emphasis varies around research, education and career poles, we can expect to see libraries evolve to support those emphases more strongly.