As mentioned before me, there would be zero incentive to release the game for free. They just spent money reclaiming the console right's back, to release it for free would be counter productive.
Now, let's say for hypothetical sake, if they had an A16 update in their hands, and they released that as a DLC, then there could be a reason to attempt this tactic. Draw in new players with the current version for "free", then cash in with a full A16 (at minimum) DLC.
Current players would rejoice (let's face it, unless you don't play it anymore), majority would buy it, and the newer players who have come to love the game would possibly buy the update as well
But alas, they would need an A16 DLC to use as a carrot to draw people back in. Without it, offering it for free simply wouldn't be logical.