Look, I'm not saying that Kane will necessarily be at Spurs until he retires, although he might be.
I'm saying that he won't be sold this coming summer, regardless of how outstanding his performances might be for the rest of the season and at the World Cup. This is because his continued presence at Spurs is crucial - iconic - in the run-up to our new stadium - and during our first season in that stadium ... crucial for a whole variety of commercial/sponsorship reasons to do with Spurs and the new stadium. Levy knows this and thus he simply won't sell.
Real Madrid (or whoever) can offer £200m if they like, but it won't budge Levy.
I'm sure you know how systematic tapping up works and serves to destabilise players until they make the move.
Kane very probably has the best intentions and well wishes towards Spurs imaginable, but when he's got offers that could double or even triple his wage, plus a lower chance of winning trophies by staying where he is, it would actually be mental if he remained resolute and true to his initial words.
His profile is, or has, raised to the point where he deserves the going rate an elite striker gets paid, and that's as a bare minimum. Trophies he may or may not be able to do without, who knows, but I don't know of an elite player who will allow themselves to be undercut.
Even the Messi's and Ronaldo's constantly have their contracts renegotiated and bumped up and that's not necessarily because they're mercs or trying to fleece their clubs - it's because they are paid their worth to keep them happy and ward off potential suitors. Barca undercut Messi, and he'd be off, just like any other top player at any top club.
Levy is Levy and Kane may well be iconic, but the bottom line is going to be impasse if this iconic and crucial player is only worth £200k and the wage structure cannot be broken for.
You've an elite player on your hands, and with that comes the burden of paying the going rate and treating him like one.