I doubt they would do it unless the case goes to trial. For one, fans have short memories and will quickly forget off the field indiscretions and Ronaldo will remain the most marketable athlete in the world. (Even if Nike drops him, Adidas will pick him up without a second thought). Second, Agnelli is a ruthless individual and will only let Ronaldo go if he massively hurts Juve’s image. Third, unlike Ronaldo’s sponsors, Juve have invested far too much in Ronaldo already. (117 million euros+ 60 mil in salary for the first year alone). It will be almost impossible to prove that Real knew about his involvement in the alleged sexual assault (although they almost certainly did) and get his transfer voided.
All in all, unless this goes to court and Ronaldo is sentenced, I don’t see it happening.