If there's not any lingering concerns about Lance's maturity in the FO and how that will continue to integrate with the team, then they will do what it takes to keep him. He helps the team win and he's a fan favorite. He also is the piece making the team a one of a select few teams who could legitimately be expected to win the championship.
You don't let that situation be weakened if you're actually interested in remaining among the elite of the elite.
If they think he's a ticking time bomb then that changes things.... But I don't get the feeling they think he's a ticking time bomb. He might still have some growing up to do to better focus his energies and emotions but he's not Artest crazy either.
If the team does let him go I don't think it's a given they re-sign Granger either. It's Lance they will be worried about replacing first and foremost and Granger is not a suitable replacement for Lance. IMO.