Trust me - the church began hemorrhaging members long before Leah Remini and Mike Rinder ever left the cult. They've been contracting for over thirty years now.
The church has run off the vast majority of their members. Today, they're down to no more than 50,000 active members in the US. In the 70s and 80s their orgs were bustling beehives of activity. Today, they're practically devoid of life.
Miscavige doesn't give a damn about Scientology. He gave up on the religion and its adherents long ago, and has spent the last twenty five years squeezing every last dollar out of the Scientology public, and amassing a fortune in real estate. He couldn't care less if the whole thing imploded tomorrow. He's got a diamond encrusted, platinum getawy plan, all set to go.
If not, he will one day die like crazy L. Ron did and unless he repents of his cult and comes to saving faith in Christ I wouldn't want to be in his proverbial shoes when he stands before the Lord Jesus Christ in judgment.