Does that imply that MARC formats are to be replaced with XML-based formats?
Fundamentally, this will be a political and economic decision. MARC formats have been in place for almost 40 years. The cost of a radical shift from MARC to XML would be huge. Some advocate keeping MARC formats by just encapsulating them in XML tags, while others advocate a more radical change. Anyhow, some kind of change will definitely take place to take advantage of the evolving computing environment.