Calling the end of the line for him for mid-2020 to early 2021
The poor fellow (ahem) has been in awful health the past decade, obese, heavy stimulant drug use (adderall cocaine etc), just had another brat (makes six), running five companies, spends all his time on a private aeroplane getting radiated (recently had a throat tumour surgically removed, must be constantly breathing fuel vapour) && has an inexcusable sleep pattern for someone so wealthy. Mister Musk is doubtless on track for a heart attack or stroke if he doesn't get the Corona virus from one of his cadre.
Would hate to see it so young (is he 50 yet) but I reckon it'll go that way if he doesn't shape up soon