I'm sure the council would be delighted at the prospect of a chunk of useless stadium being left behind and will wave it through.
It will make the planning process more difficult which will affect the sale price of the land to a developer or... they could work with the club and come to an arrangement. That could either be agreeing to sell together for the best price or them selling the current stadium to us at a more reasonable price than the quoted £20m (IIRC, not sure... it was something stupid) when we first went up.
Either way, we're in a much better position than before when it was simply "Here's our stupidly high price. Pay it or don't, we don't care".
I'm still assuming we would need the land to form part of a land swap, not sure about that, but in that case we'd be looking to try and strike a deal with them.