i think lukaku is well ahead in ability and potential though, he's already come back from one or two biggish injuries and been fine with it.
I don't really think we can be fear mongering about 'future' prices when it's not a very good mentality to have.
He's our best striker for about twenty years, and if you want to get into champions league, you have to do your best to keep him.
He isn't the type of lad to want to jump ship after one bad season, i don't think that's his mentality at all.
He does think he can be one of the best, but that's the mentality that all the greats have to have. I'm sure in a few years if we don't win things, and don't get champions league he will leave.
But i think he'll give us a good few years of trying to do so before he wants to go.