Organizations are not really "owned" by anyone. What formerly constituted ownership was split up into stockholders' rights to share in profits, management's power to set policy, employees' right to status and security, government's right to regulate. Thus older forms of wealth were replaced by new forms.
It's the new management's job to look at the world as it changes, and how do we look at change and take advantage of change, rather than put our head in the ground.
A company's enterprise architecture is unique neither good nor bad, but only appropriate or inappropriate in regard to management's vision of the future. The current enterprise architecture either supports the vision or it does not.