I think the duphin wasn't allowed to go where he wanted, was he ? I mean, it wasn't easy to bring him elsewhere than Versailles, even for health reasons.
Switzerland could have been better for him ! But that was impossible, I'm afraid. That must be terrible, to see one's child deperish, and to be forced to keep him in a bad place. I'm pretty sure Marie-Antoinette knew Versailles wasn't good for her children, but that the queen and dauphin were tied up there !