I think the second game unfortunately got caught up in the discontinuation of the Dreamcast. It was only released for Dreamcast in Japan and Europe, while in North America its release was delayed for a year so it could be ported to the first Xbox, and the Dreamcast version was cancelled. Personally, I think if it had been released on schedule as originally planned, it would have been a million-seller like the first one. But, that's not how it worked out. At this point I think if there was a third game preceded by HD rereleases of the first two, we could expect sales of about 350 - 500,000. With a more efficient development process compared to the original, I think it could be made on a more modest budget and recoup the expenses to make it. I'd look to it primarily being a digital release, with a limited collectors' edition priced at a premium for the superfans.