I think Don is setting up California to be this savior for him when in reality he will be just as big of a miserable prick there as he was here. How many episodes until you see Don with his young piece of California side-ass? I sort of hope S7 is just more of a descent into lonely misery for Don instead of a redemption.
How long do you think before we see Don being a prick again though, if that does happen? Because if it happens within the first few episodes that would odd considering season 6 ended with Don embracing his past and opening up to his children.
That act alone hardly redeems Don, but it does seem to be the first step towards something better or more stable at least.
Don sliding into lonely misery though could still happen but for it to happen in the early episodes of the last season would seem bizarre considering season 6 ended on a somewhat hopeful note with Don showing his children his birthplace.
Although technically wasn't the whole slide into lonely misery, or just misery theme done in season 6 already, not to say you're wrong of course, but Don was in pretty bad shape in season 6.
Personally whether they go with redemption for Don or he fails to change and becomes more of a miserable prick, I'll be happy as long as its interesting and entertains me.