I'm of the opinion that as much as Wagner and Roden have been swinging a pool noodle to date, it's far too early to give up on them. They're not being completely overpowered or the K/whiff rates would be bad. Roden in particularly hasn't been drawing as many walks as you would want, but he's a guy getting his first taste at the MLB level so he could be pressing, or just hasn't made the adjustments to make himself feel comfortable with taking more pitches. The projections for both these guys are what they are because their success at the upper minors was legit, despite merely okay power numbers. Not many Ks, good amount of walks, lots of line drives, that's been their profile.
I don't think there's any good reason to send them to AAA just yet, this could just make things worse. Roden needs to fix his swing path, there's no question about this, to what extent the team believes this can be worked on at the MLB level versus a lower pressure environment will be the determining factor. He's providing value in other areas which has been a surprising development, so while he's not totally killing you, see if he can make adjustments on the fly.