Azure Arc was announced very recently https://azure.microsoft.com/en-gb/updates/azure-arc-for-servers-in-public-preview/ and https://azure.microsoft.com/en-gb/updates/azure-arc-for-servers-in-public-...
Updated Nov 02, 2021
Version 2.0
Blog Post
I am not aware of any plans like that, so wont comment. However you only need the connected agent for Arc, but can also use the MMA "when you want to proactively monitor the OS and workloads running on the machine,"