Before doing enterprise architecture, PLS have well-defined business process and its specific owner. Their role will be similar to Product Owner( a term in Scrum ). He have to develop the process and ensure it up-to-date.
Making Architecture need to be lived in daily operation process and easy reference to. Stakeholders and IT stuffs are in the same page and system(or tool).
Some KPIs is used for evaluation an architecture success :
1. the reduce number of database platform
2. increase the operation capacity to more servers & databases by the same of stuffs
3. the steady growing number of servers and databases w/o hire more people
4. the above situation also applied to network infrastructure / web servers / applications / softwares
5. increase the stability of infrastructure and applications
Refer to the article : Making Architecture Matter
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