I thought Sandland was absolutely great myself.
It just didn't fit well in Shonen Jump, the stories move so slowly in Shonen Jump, to drag out a one shot is just ridiculous.
As for Viz getting all Toriyama mangas, it is quite likely. I could see Cowa and Kajika with the Shonen Jump label on them. Most of his one shots probably wouldn't come over because thy seem like pre-ideas for his other series. Pink seemed like it was in Sandland's world, and Dragon Boy was Dragon Ball with wings instead of a tail.
A Blue Dragon produced manga sounds awesome from what I've seen of the game. I hope Toriyama is allowed to take whatever route he wants with it rather than be under strict guidelines. Kinda glad, now I don't have anything I want from the Xbox 360, because the only interesting game to me is going to be a manga.
Did Toriyama ever write Dragon Quest mangas? I know he does the art for them.