Quote Originally Posted by Kawaii Ryűkishi
They already did that, with the Itadaki Street series. It was called Itadaki Street Special.
Itadaki Street Special was announced like sometime in 2003 and was released in Japan late last year. It's in the past. And if a domestic release were their announcement, it'd be even more of an overestimation since no one outside of Japan cares about the Itadaki Street games, and even the FF+DQ element wouldn't sell much since there aren't many more Dragon Quest fans than there are Grandia fans.