Bit of both. Gini/Fabinho/Keita/Ox are unlikely to be replaced any time soon, but one has undoubtedly underperformed so far, while the other has been out for 9 months. Milner has been class, but is aging. Lallana needs to move on. Hendo is somewhere between Milner & Lallana.
I'd say we've 5 midfielders (Milner/Gini/Fabinho/Keita/Ox) who've got a lot to offer us in the next few seasons, & many would throw Hendo into that conversation also. I'm not saying Rabiot isn't talented, and I'm definitely not saying he'd be a bad player for us, but with the question marks over his temperament, I really don't think we need to risk adding him to our squad in the middle of our best domestic season for almost 30 years.