Honestly, Eriksen is very good, but he isn't as key as some people think. What I mean by that is he actually stops Poch from playing counter-attacking formations and that is part of the reason we struggle against bigger teams. Okay, yes, if we sell an Eriksen, and buy a Sissoko, then there is a problem, so I can see what people are worried about in terms of that. And yes, he could play in a deeper role as he gets older and we could sign a very good pacey forward who gets in behind instead.
However, in general, I think that Eriksen dominating a game for Spurs hinders us more in terms of scoring goals as it means it is unlikely Son, Kane, and Dele are dominating the game. I have said it a long time ago, if Eriksen is MOTM, chances are we win, but it is a lower-scoring game, we sneak it, and the rest of the players weren't as good as a team. When you are over-reliant on one good slow creative avenue, it stops faster flowing team solutions on the break. I believe it is the case with Eriksen, and in terms of winning titles I don't think he fits in the front three.