L Ron Hubbard had many moments in his career when it came down to ""What To Do When All Else Fails". Read some biographies and it quickly becomes apparent that if there is one constant in his dissolute life it is that of constant reinvention. Wog world came close several times to putting a stop to the fraud. Perhaps the closest was in the late 1970s with the Julie Christofferson-Tichbournes (et al) proceedings which resulted in the massive corporate sort out which was the answer then to "what to do when all else fails". In short, L Ron Hubbard was constantly reactive and always coming up with new policies and changes to serve his circumstances.
L Ron Hubbard's modus operandi has always been draconian and there is nothing David Miscavige has done which is beyond Scientology policy and/or the personal example of L Ron Hubbard. It is true, however, that L Ron Hubbard's tech cannot be dramatically changed. With this in mind, we can probably expect a repeat of what has happened before. In other words, I'm picking David Miscavige to "resign" (but not really) and some numpty put up in his place. Alternatively, David Miscavige and his enablers may well be turfed out and we shall see a return to the fold of all those ousted over the last few years. There are many who labour under the illusion that Scientology would be great if it wasn't for David Miscavige. If that's the case, we might even see a return to the franchise model. Either way, wog world can expect a sustained apology along with claims like "it was a few rotten eggs, we've learned our lessons, we'll do as we're told, come on back, its all been sorted out". Except, as we know from the 1960s, 70s, and 80s, it will simply be a case of "meet the new boss, just like the old boss."
On the other hand, perhaps we will see the end of Scientology as we know it. Surely the primary scam has had its day, I mean Xenu is long out of the bag, perhaps now is the time for its enablers to cash-in. If that's the plan, the less pesky public and idle staff around to get in the way, the better. Might as well drag it out for as long as possible, squeeze the last penny out, and shed as many hangers-on as possible while securing the escape routes. David Miscavige and a few others are "loose ends" and could meet with unfortunate accidents or the perp-walk, probably around about the same time the cash reserves, trademarks, and real estate holdings evaporate into some labyrinthine legal artifice, along with the PC folders, and lists of corrupt officials and politicians. The Mafia call that caper a "bust out".
TL/DR: I am grateful to you for this opportunity to speculate, L Ron Hubbard was always a chameleon, I believe a focus on David Miscavige is a distraction from the ultimate aim of bringing about an end to the abuses of Scientology and delivering justice to those who cry out for it, we are, indeed, in interesting times, and Scientology is well-behind schedule for another metamorphosis.