Agreed, he would be a perfect fit for Inter now. I guess he is kind of Inter fan? I see alot of pictures etc that he visits Inter a few times, even visiting a evening match and training the next morning in Monaco. I'm a fan of him, he did fairly well for us. Not always giving the minutes he should have had with a declining Perisic at his position. Never liked him if he had to play on the right wing but with the new system he would be great back-up as a SS.
Keita's a victim of his own limitations as much as he is a victim of the modern football market.
He's just one of many decent players who was bought at an inflated price by some dipshit, nouveau riche club like Monaco. Since then, his price tag and wages do not match his ability and you're left with a way over-valued player who is stuck between being not good enough for top teams yet too expensive for mid/small teams.
Same story for Joao Mario, Kondogbia etc.