I don't think Nioh feels like an AAA-title. I could imagine sequels with SoulsBorne-appeal, with bigger boss fights, with less copy-paste design and clever enemy encounters. Nioh does have potential. The combat mechanics are very unique and ideas like the different stances and the related skills are brilliant. I'd love to see a sequel with more variety and polishing. In terms of gameplay Nioh feels much more japanese than Souls and both franchises could co-exist perfectly.
Personally, I'm sceptical. I don't think Koei Tecmo will offer the budget for potential sequels to go en par with Souls. I can imagine Nioh will get the Musou-treatment and we'll get sequels without bigger changes. And then the Dark Souls 2 effect could kick in and we will play great games with a small feeling of disappointment.
But that's just me being pessimistic. I enjoy Nioh a lot. And right now I don't need any sequels. Nioh is a fantastic original game in its current state. I can't wait to discover all the game mechanics, the lore and I'm looking forward for PVP and coop material grinding.