No matter how many units they sell, this car will become an instant classic. It's an engine with an incredibly high ceiling, making it ideal for tuning. Also, it has loose ties to the GR Yaris and WRC.
Keep in mind this will be likely one of the last cars of its era, i.e. combustion engine with a manual transmission. In decades, it'll be looked at as the last hurrah of "those good ol' days". As such, even if it's not the fastest, lightest, or most powerful hatch, it will still have a lot of historical significance.
However, after the dust settles, it may depreciate a bit before it appreciates. But it will never be worthless. Example would be the IS F. Given a few decades, it'll be a very unique car. Think about how people react to seeing a Cosworth or Renault 5 Turbo.
That being said, I don't plan to ever sell the car. So it's irrelevant to me what it could sell for.