I really don't know about any sort of Sonic movie, lol, especially one written by anyone at SEGA. Sonic can carry a decent storyline, even a great one if last week's Sonic comic was any proof, but I'm not sure the video game form of Sonic could really do it. I honestly don't look at Sonic Colors or Generations and think "Yeah, they could make a movie out of this".
A Panzer Dragoon movie would be totally epic, though, live action or CGI. It's got a great world and some epic set pieces, and the storyline is vague enough that any talented director could take a movie based on it, honor the source material and make it their own. I mean, can you imagine the massive battle ship scene from Orta in a movie? That'd be fucking epic. Lord of the Rings on flying machines, bitches.