The fall of each senior bot may have its own particularities, but the fundamental cause remains the same. FLP's rapid growth a few years ago led to the inevitable saturation, which all MLMs encounter - ironically, the more successful they are, the quicker this tipping point comes.
Essentially, there are no longer enough potential recruits to replace those leaving. This is not only a mathematical population thing, but ever more people also know people who have been burnt by FLP, or come across anti-MLM forums such as this one, or see something like the BBC documentary.
When a normal business is confronted by a saturated market, they scale back, lower production, close a few outlets, etc. The MLM model is predicated on continual headlong growth. When this is no longer happening, the whole edifice crumbles.
Those at the very top of the pyramid, those closest to the real owners of the company, who have played a long-term role in its strategic operations, will be afforded a measure of protection, partly so they stay onside and don't make any damaging revelations, partly because keeping a couple of 'headline' top earners will hopefully help slow the decline by convincing some of the dwindling pool of existing and potential bots that it is still possible to attain riches.
What those top bots will find out is that the mathematical laws at work will win in the end, and it is the owners, not them, who call the shots. They are also ultimately disposable when they become too expensive relative to the money being made.
This will not really be of too much concern for Bloodsucker and Uber, as they will have made more than enough to actually be minted and/or have diversified into new markets early.
The likes of Castle, Yawn, their respective BFFs, Lanza, PhD, Insolvency, Homeschool & Co are finding out the hard way that it was never their company.