Kudos to Parse for providing an open source path forward. I know a lot of enterprise users who will only look at fully open source stacks, for a variety of reasons. It's good they are giving users a year to migrate. I expect Couchbase Mobile to see a lot of evaluations as this process plays out.
I will be watching to see how the community grows. It looks like the ExportAdapter.js module in parse-server is low hanging fruit to connect to stuff like Couchbase Sync Gateway, which would give access to a multi-vendor ecosystem including IBM and Apache.