In a mixed environment with ArcGIS and QGIS, it would be great if we could export an ArcMap/ArcGIS Pro project into as a QGIS project.
I think the best bet for something like this to ever see the light, is through the new / upcoming styling options in the OGC GeoPackage standard:
It will probably take some time though, before we will see any decent support in the different GIS software solutions.
Of course, with Pro adopting the common JSON format for its layer file format (*.lyrx), nothing prevents you from writing your own converter to ingest Pro layer files. This was not possible in ArcMap.
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