Ofcourse Harry Kane is probably not the only player that would boost the performance of the club, there's always a backup replacement for such good talents, not too difficult to avoid.
Harry Kane is a very good striker and he has played at world class level many recent years. The striker is like a quick guarantee of success for great clubs but there is a big risk that after a few seasons, Harry Kane might considerably lose his best performance when his age is more than 34 or 35. However, having a player who can help a team to win titles in like 2 or 3 seasons is very worth to take risk.
Rejecting €100million from Bayern Munich, funds that would have been utilized in getting more talented players from the market. Tottenham Hotspur should try to employ new squad, the same way they keep sacking and appointing new managers, simple. The board keep making flimsy excuse for their incompetence to sign good players, keep restraining their old players, scared of losing them and decreasing in their performance.
I think Tottenham will sell Harry Kane when they receive a price they want. It's just they have yet seen their wanted price and Levy is trying to bargain for a better price to sell a brightest star player in Tottenham Hotspur.