I would think if they were that reliant on Toy Sales they would have actually put toys in the stores.
Different values of "they." The network is not the toy company; rather, it depends on the toy companies' revenues from toy sales to help underwrite the production costs of the show. Ideally the funding for the show comes from a blend of the network, the advertisers who buy commercial time on the show, and the toy company that makes the tie-ins. If no toy company agrees to develop a toy line, or if said toy line performs poorly, then that requires the network to carry a larger share of the show's production cost, and that makes the network less likely to keep making the show.