Semantic Versioning allows for versions 0.10, 0.11, etc. OiaL just happened to be 10 updates with the final one being full release (0.9 to 1.0) . 1.0 indicates the first major release (story finished), so it will end
there as long as it doesn't need patches/fixes/expansions for some reason.
IIRC I saw rumors that Eternum is expected to have about 11 or 12 updates before release, but I don't have a source for that.