I'm not sure he's ready to leave the Netherlands just yet. He's only 20 and this is his breakout season with Ajax.
Incidentally I think we are building ourselves to be in pole position when players like him become available.
We're building a squad with the age profile that we could realistically go several seasons without signing anyone, and that means being in a position to jump in and get those players who might be a gamble, or need developing because the needs of the squad aren't immediate.
When you're no longer planning for next season, you can get some amazing deals, like Real Madrid have done with Ceballos and Asensio, or Bayern with Corentin Tolisso or Coman a few years back.
That's when we'll really start to build a long term dynasty, when you're picking up 18/19/20 year olds on the cheap before they make a big move and letting them incubate at City, because unlike United/Chelsea/Liverpool we don't need to urgently upgrade the starting XI.