This would be a megaton, but I lean more towards doubting this. Nintendo and Square Enix's relationship has improved greatly since then so anything is possible. With the uncertainty of the Mario & Luigi series, who knows where Mario RPGs will go from here. I personally think the Mario & Luigi series has gotten stale and the RPG genre and Mario need a shakeup. This would do it.
Square Enix holds their games ransom, because they know if they hold out long enough, Nintendo will bend over and do it. They've been doing that since the Wii/DS age. They dont do that SONY. All those SE games that Nintendo published, if they PS games, SE would have published them promptly.