Obsessive rolling provides a nice touchstone to the original, so I think it should be an option for nostalgia, if nothing else.
I know you are kidding, but in case you are not - I would say that Nostalgia is much like Sentimentality in that it is the domain of sociopaths and not a good reason to do anything.
If we view existence karmically, as a series of attachments to be shed, then Nostalgia would be at the top of the list of negative attachments.
You got it completely wrong. *Not* being able to feel sentimentality is a hallmark of sociopathy, not the inverse. Take sentimentality away from the game and you're pretty much only left with the obvious financial incentive. A truly bad reason to make a sequel as loads of people very much expect sentimentality in some significant ways in a game that daringly attempts to build on the great legacy of a 25 year old game.
As for your idea of hard-locking people out of re-rolling in the single-player game, it is akin to grieving. The dice rolling graphics already in the game can be used to impose a soft-lock in practice. Simply make the player roll for each individual stat at a time and time would be a barrier in itself. But it would be much more entertaining, capture a bit of the spirit of D&D and a bit of sentimentality of the original series, while not being as frustrating as the re-roll mechanic of the old games which invariably led the players to accidentally clicking past really good rolls as they were generated instantaneously and unlimited.
The only issue I see with rolling stats in a single-player, would be unbalancing your game so much combat becomes trivial and boring. Then again, you can do the same in any game with a difficulty setting - so another way doesn't really account for much.
