Ake is not above VVD, deLigt, or deVrij for the Netherlands...To be honest, I think Ake is pretty much nailed on for the Dutch starting eleven alongside VVD in the WC whoever he plays for, or how often he's playing.
Same with Raheem Sterling for England.
It's not about the World Cup, imo, it's just about playing regular football. Both Ake and Sterling probably see themselves as no more than 'bit players' at City. They need these moves.