The squad really is not that far from the one when we bought RVP. Realistically we have to show that we want and will compete witth the best and the rest of the PL teams. City will be just city like usual, Arsenal is like Leicester of this year. Nobody expect them to compete for PL title this year, Chelsea has their own problems and who to say they gonna to gel. We are better than them this year and if we spend on the best to give us the BEST CHANCE, why cant we challenge for the tittle.
We have to and must show that we want to win. By your logic, we go and buy the young striker and wait for around 2/3 yeara then we will still have to replace the older core players (Case, Varane...) then what, wait another 2/3 years down the line for the replacements to gel and get up to spees with the squad.
Dont wait, if you have the almoat proven and sure thing as Kane then go for him and show that we want to win the title and will do at any cost to win it. Case, Varane, Licha...ect wont be happy if we show that all we want is top 4 and try to bring down the age profil of the team rather than quality. However, by no mean if EtH dont want Kane (stylistically speaking) then go ahead and buy other.