How's the relationship between the UCI and Rabobank? One doping case during le tour is easily enough to remove Rabobank as a sponsor from cycling. Not sure if the UCI would want that, though, it's a big sponsor which also has a woman's cycling team and an extensive development program.
If a Rabobank rider is caught, it will probably be a non-Dutch rider, as the UCI wouldn't want to destroy the growing Dutch cycling scene. My bet would be on LL Cool S: He's been training on his own a lot, thus it could easily be classified as an individual case resulting from improper management (not enough supervision, like the past Raboscandal).
Wynants is not so likely, as it would trigger questions about his former team, QS, and, of course, there may never rise any suspicion about the currently hottest team in cyling, OPQS. The UCI has a reputation of protecting those who are hot.