In theory you'd be swapping Eriksen for Xhaka who are both the same age profile, but yeah even then I'd still avoid it. The summer represents a great opportunity to re-balance the side. Ozil, Mustafi, Sokratis, Luiz out the door, all will be 29+. Ideally we can shift Laca and Kolasinac too. That's about 900k a week on wages saved too on 6 players who contribute nothing. Use that to get just 1 player in their prime or entering their prime and we'll be better off.