I don't think Keep will go away; its one of only 14 of Google's products that they classify as "Workspace/Enterprise"; alongside Gmail, Meet, Chat, Calendar, Drive, Docs, Sheets, Slides, Forms, Sites, AppsScript, CloudSearch, and Jamboard.
Google Voice seems to have been added to Enterprise, so I cross my fingers it will prevail.
Meet is for (planned) Meetings.
Chat is for text/audio/video chats/calls.