So apparently casuals on mobiles do care about Dark Souls but real gamers with Wii U don't?

This actually seems to be supported by the fact that the Armored Core franchise has expanded into the mobile market. I personally am not as spiteful of mobile gaming (probably because I have a few friends working for small, indie developers making small titles for mobile, PC, and Xbox Live/PSN), but I do hope that the Souls franchise remains a traditional, gaming experience.

Good thing they don't own fromsoft or any of their IPs.

What should happen is a port of Demon's or Dark Souls. A port will keep costs low, and Namco and From can see if there is a significant fanbase for the Soul's games on a portable.

Edit: Mobile=phone. Then, no.