IF he has turned down multiple offers, there's still no need to panic. He's still got three years left on it (or did
Moyes hint at an option for one extra?). He's not done enough in the second half of this season for clubs to come in with big offers (£60m+), so it's just business as usual.
If he doesn't want to be here long term, then he should concentrate on playing to his potential and looking for that big money move next summer. If he does, we'll be happy with his performance and hopefully the transfer fee, and he'll be happy with the move.
There's aways talk of clubs like Brighton being well-run. Sell players for profit, good scouting for the replacements. If we want to be well-run in the long term, we need to be making a profit on players too rather than hangning on for too long while their performance and potential value drops.