Since discovering this band as a child in 1991, I have been Team Stevie 99% of the time. But Lindsey has been the creative driving force behind FM since 1975, and while I'm sure Stevie's animosity is justified, at some point you have to forgive and forget. Or at least forgive.
The only reason I can possibly think of that Mick would fire Lindsey is if Stevie said "it's him or me". At the end of the day, Mick knows a Lindsey-less tour will still make more money than a Stevie-less one, and we all know Mick follows the money...
That said, I won't believe anything until it comes directly from one of the horses mouths.