Well, I have recently heard that Sierra will no longer be making Spyro games. He might never have another appearance, although it's likely another company will get the rights to him. What do you think?
PERSONAL OPINION: The end to Sierra-made Spyro games can only be good news, as they have presided over the worst Spyro titles out there. The Legend of Spyro series was as unfaithful to the originals as could be, and Sierra also made Spyro: Shadow Legacy, which was probably the worst Spyro game ever, even worse than Spyro Orange.