JRPGs...nowadays, what company has the most potential to be "the new Squaresoft"?

[S.T.A.G.E.]

Sakaguchi saved Square from dying by creating FF (the reason for the name, you'll notice it with a lot of his other games "Lost Odyssey" or "The Last Story"). Hes in Mistwalker and still kicking therefore, Mistwalker is the new Square.