There will be distributed developers in your organization who will persist in doing things their way. If you can stress and show the benefits of playing by centralized rules, many developers out there may jump on your bandwagon. The key to building a data warehouse is to understand end users' needs and how they use data. Avoid cost-justification if at all possible because it's difficult to put a dollar value on decisions made with warehoused data. Don't confuse warehouses of redundant data with operational databases linked to specific applications.
Disaster recovery is less of a critical issue for redundant data in warehouses.
It's better to segregate non-redundant, irreplaceable data to the more secure operational databases. Organize application developers along functional lines of business while organizing help desk, networking, testing and database administration staff along technical lines.