Wow! Congratulations, Dave. I sure hope that I get one of those calls before my Allure cruise on Sunday, but fat chance of that happening.
Actually, I was pondering the situation and it is possible that someone would turn down the upgrade if they had other friends/family on board with cabins nearby their assigned cabin. Personally, I would choose the Grand Suite over family any day, but that's just me!
For example, on Sunday, my wife and I have a balcony stateroom and my daughters/niece are across the hall in a boardwalk stateroom. There is 0% chance that my wife would move anywhere that is not within 100 feet of them. I think that I would go ahead and accept it and just not tell her!
Again, congratulations and have a great trip!