If we don't finish in the top 4 (which, let's face it, we're certainly not favourites to), Lukaku is just as likely to end up at Spurs as he is here.
They have more money and the attraction of being in London.
Would I spend £20m on him? I don't know, I really don't. Sometimes he looks like a one man team. Pace, power, finishing, etc. Other times when he's trying to link up play, he's pathetically bad. If we signed him, we'd need to sign another type of striker for certain games too, the sort who can hold the ball, can control it and is able to link with other players well.
I change my mind about Lukaku on practically a daily basis.