If they want it to last that long, they need to give the series a damn break. Stop releasing so many spin-offs every year, make some new IP's or something!
I would say Dragon Quest would outlive Final Fantasy without a doubt, as they're actually taking care of the series. However, I don't know what will happen to it if anything happens to its creators. Still, it's a much better example of how to run things if you want a series to last "forever." The most recent game, DQIX, will easily be the best selling game in the series. It remains to be seen how well the newest Final Fantasy will sell.







