Collection asset automatically updated by keyword

We're looking into using collection assets because we found the timeline feature which is AWESOME! What would be great is if those collections could be automatically populated with assets based on keywords. For instance if we had the keyword "Donald Duck" as we write stories with that keyword it would be automatically placed into the Donald Duck collection. That way we wouldn't have to remember to manually add assets to collections.

Basically it would be block query rules for a collection asset.