I think we should move the now-invalid words to the "obsolete fu'ivla" category (we may need to create an "obsolete experimental cmavo" category as well) and see if there are systematic ways to fix some of them that we can agree on (for example, maybe adding apostrophes when it doesn't result in a lujvo, or doubling the glide vowel CgV => CggV). Automatically downvoting them to -10000 would make a lot of words simply disappear and I don't like that.