Actually, this game is leaning a bit toward the original Paper Mario. I've beaten the first boss and made some progress, but so far it's so much fun. It's better than both SS and CS combined. If it keeps this up, it'll definitely be in the top tier of new Paper Mario.
Also, I don't think Paper Mario will ever be an RPG again. I think I saw a long time ago, I would find the article, but it was like 2015 or so when I saw it. However, they said that they moved Paper Mario from being an RPG because Mario and Luigi filled the RPG aspect of Mario so they wanted to change it up for Paper Mario. So I don't see it returning to form. However, I think it would be cool to get a remake of Paper Mario 1 or TYD with the new paper look. That would be interesting.