Yes, the marinade will start to break down the protein in the tofu after about 24 hours if you use the softer tofu types.  However, the high-protein super-firm tofu can be marinated for up to 3 days without getting soft or crumbly.  Note:  Be sure to keep your tofu in the refrigerator the whole time that it's marinating.  Tofu can go bad quickly when left out of refrigeration.