I don't see it going online only. Certainly stupid to do.Take2 would however defend any new release, since to them, modding is worth going to court over. Just to mod Bully 2 you could end up facing a legal battle. Often the company with a lot of money and legal backing wins.
I also feel out of the entire list of titles from Rockstar, GTA is clearly being pushed the most with RDR following. This is a very bad business model since it's exactly what brought Konami to where they are now. Find the real money makers out of all games and just ride it into the ground.