We need to give Havertz the best possible opportunity to flourish. The club has invested a lot into him and his potential. He's just begun to show signs of genuine progress in that role and it would, to me, make little sense bring in a #9 and mess with that progress just because we underperformed our xG this season. If City buy Kane, we're most likely not competing with them regardless and bringing in someone like Lukaku won't change that.
I am not so sure City are going to clean up like everyone thinks. I look at their side and they have a few big players that are either going to be on their downward spiral (i.e. blow their peak level now) in the few years or gone:
KdB - Has another 2 years of peak at most. Still will be a very good player but not what he is atm.
Gundogan - Likely gone in 2 years
Walker - Probably already past his peak
Kun - Gone this Summer (I preferred him at his peak to Kane.)
Fernandinho - Gone soon.
Mahrez - Will be past his peak in two years.
Sterling and Silva - both probably got two years of peak and then will start to tail.
For me, City will probably still be top dogs for the next two years, but I do not see them as ultra scary past that, even with Kane who probably ages out with KdB, Sterling, Silva and Gundogan.
Of course, they'll keep buying but those players will require some picks to be replaced. However, at CB and GK they're set for 5-8 years.
