He is still a midfielder in my eyes, no matter how many times he has deputized as RB.
The Xavi-Iniesta comparison always made him look inferior as a md, but that's not fair. He is a different type of md, and the last 5-6 games we have seen some traits of what he can offer there.
There are many things that a RB 'naturally' does that Roberto does not, because he doesn't 'feel' it.
If Semedo stays, Semedo should cement his place as first-choice RB, and Roberto should find his permanent role in the md