I think people overestimate how much these games need to sell in a digital economy to be worthwhile.
Like, Koei Tecmo's stuff has been selling jack shit for ages, but keeps coming over. We even have a nigh assured mega bomb unit wise like Arslan coming up.
On the surface, this would seem confusing, but let's work out the math.
So with Dragon Quest Heroes, we have 18,000 copies * $60 * 0.7 for the publisher cut and we get $756,000.
The game hasn't went on a real sale, and they're likely already way over the cost of making the port given their tech base already supports the platform.
Where retail games run into issues is you pay $12 to print a copy whether it sells or not, have to print 5000-10,000 copies to even get your game made, and your margin goes from ~60% at full price to ~15-20% by the time your game is $20 versus statically staying at 70%.
This is why publishers are always hesitant about retail versions of niche games, but more than happy to bring out digital versions even with notably low sales.