Welcome to the Q&A Forum

It's going to be very difficult for sites to abuse the schema.org structure, though I don't doubt some will try. And if a site does go that route, it's essentially a deceptive business practice, which may cause them other problems.

Well, we just want to show less links to Google than to the user (but the links for Google are still a subset of the links shown to users). The links we'd do as JS links are those to less often applied search filters, which we don't index in order not to spam the search index. Fortunately, if Google is smart enough in decrypting the links it wouldn't do any harm. Thanks for our ideas tough! Especially the site: thing I considered myself, it really takes ages until something is de-indexed (for us, using robots.txt did speed it up by a magnitude).