Automated Request Manager (ARM) is part of WorldShare Interlibrary Loan (WSILL,) so libraries will still have access to the tool while they maintain a subscription to OCLC WSILL. You can use OCLC Usage Statistics to see reports on ILL to review your current usage of the automations function.
ARM is part of "Smart Fulfillment," and some of these fulfillment options may have to be reconfigured for non-WMS libraries. For example, WMS libraries are automatically configured for real-time availability for ILL. Further configurations automatically applied to WMS libraries need to be investigated further as it relates to Koha.