If they wanted to build a team to win things & keep their best players & had the means to do so then they should react to what other clubs are willing to offer the lad if they want to keep him ofcourse.
Otherwise they would lose him, as realistically they likely will at some point.
Its very simple, if you dont negotiate you'll lose your best players as the player will nearly always go for the money if its being offered & they are being much more highly valued elsewhere.
How much would you be willing to give Carroll?