Consolidation vs ITIL

It seems to me that ITIL best practices and consolidation conflict in goals. ITIL focuses on isolation of faults and features to make it easier to manage services. Consolidation aggregates services to reduce the need to manage. I have been working with customers on converting large iron database to commodity rac clusters. It seems like the biggest benefit is not consolidation but making everything the same. The same OS version. The same database release. The same stored procedures. The same app features. Splitting services tends to cause drift when it comes to patches, tuning, and customizations.