Super Metroid was released for the SNES in 1994, and gamers loved it and clamored for a sequel. Yet, it wasn't until eight years and two console generations after the last game's release that the series was continued.

That kind of thing doesn't happen every day, but it's entirely possible. It's even more likely when you factor in Chrono Cross, a late PS game which exposed a lot of new people to the series. There's also the PS rerelease and rampant emulation of Chrono Trigger to consider. The Chrono games certainly have enough of a following to generate enough hype for a new installment to sell adequately.