IMO, if Maddison decides he ONLY wants Spurs, we're better off taking the position that he gets us promoted (can't see him tossing it off all season due to England) and then walks for free. 25mil is an absolute disgrace and everyone knows it, even with relegation and the last year being a factor.
I don't envision him doing that if the Newcastles of the world renew their interest and offer him a big bag of cash. If he is serious though re only Spurs, that may force their hand a little bit in either offering more money or completely ending their interest if they aren't willing to move from their frankly ridiculous valuation. To avoid a potential situation we pretty much need other teams interested besides Spurs, which as we move closer to the start of the season I think there will be a few if he is still here.