Gamefreak wants nothing to do with a mainline pokemon game on consoles as long as they aren't portable like the handhelds are. Otherwise not a chance it wouldn't have happened by now with how big that franchise has become. At most all we'll ever get are spinoffs. The closest we ever got to a main line game was colleseum and XD gale of darkness.
In the past they said they want the series to be able to be played at home and take it with you, consoles are basically stuck in your home to a tv. Once nintendo releases a console that you could litterally take with you and play as well, that's when a mainline entry will occur, unless gamefreak decides to change their mind one day.