There's a lot of demand for VisualEditor on third-party MediaWiki instances but the Parsoid dependency is a potential roadblock for site admins.
If total source compatibility with Wikipedia articles/templates is not required, perhaps we could get away with a PHP implementation of the HTML<->wikitext conversion that's a lot simpler, and wouldn't require the external node-based daemon. This could ship as a class that comes in the VisualEditor extension, if that makes sense, or a library, or ..... who knows. Anyway, worth trying out briefly.
Alternative is to say "folks wanting this should use HTML content model", in which case VE also needs to support that...