This is all Richard's opinion on the subject, because like he said, everybody was asking about it. I don't think he has actual info.
Sadly, I think Lindsey wants a final chapter with this four a**holes, because he has spent most of his life with them and probably doesn't want anymore bad blood between them.
What he wants and what will happen are two different things. Stevie will never allow it, unless Mick convinces her, and that will only happen if this tour fail miserably. Even though ticket sales are bad, they're not that bad to call Lindsey for help. But I also think they won't add another leg.