You don't seem to be aware of how this works. Are you old enough to remember what happened to Protonix? Do you know what Teva Pharmaceuticals business model is all about?
Any company can copy the compound, change it slightly, and take it generic. By doing this they pocket 100's of millions and must be sued to stop selling it. By the time that happens, they have already made a ton $$$ , even after the lawsuit has been paid and settled - and that's assuming they loose the patent enforcement litigation.