Brining improves flavor, reduces toughness, and adds moisture. Most meats benefit – but lean, tough and dry meats (like game) benefit most of all. For wild birds brining opens up vast cooking options that otherwise would produce dry, tough meat.
This is a great generic bratwurst recipe, and wild turkey meat is a fine base for sausage. But like most recipes adapted from domestic to wild meat, fat can be a critical factor.