We use shared review regularly to collate comments from within our organisation, so it would be a massive inconvenience for this to be removed completely.
Thanks for posting your question. Workspaces will no longer be an option for the Shared Review workflow, but you can continue to use Shared Reviews with an internal server, such as a SharePoint workspace, a network folder, or a web server folder. We apologize for any inconvenience. Please let us know if you need any further assistance or clarification.