Of course if he leaves.Spurs come first, always. If Kane leaves, he becomes just another player who becomes irrelevant to the club. Sorry, but that's how it is. The only loyalty in football is from fans to their club (and by club, I mean the institution itself, not the board/owners).
But he's still here and people acting like he gone already and wish him not playing.
Kane is more than Bale was back then to us. At least to me. I won't judge him by Sky Sports and similar.