That judgment is based on the premise that the processes mandated by the ERP software are more effective than the company's current processes.
If a company terminates its adoption of an ERP solution, it does not necessarily mean that the company is not "agile" enough. The company's leadership may simply be concluding that changing its processes to the ones mandated by the ERP would make the company run less efficiently, a consideration that could outweigh the benefits of using a centralized piece of software to manage its operations.