Kind of a misleading headline; he said that he couldn’t say no if they where to approach him, but he didn’t say he actively wants a movie.
Those are two very different movies
A story of an enterprising young farmer min-maxing his late granpa’s farm, stocking barrels and casks all over municipal property, enlisting mythical creatures in providing unpaid labor.
A slice of life movie surrounding a young person quiting their office job for farming and meeting the mythical Junimo, while Joja trying to eliminate their competition, is just so fitting for Ghibli.