I think it's a simple matter of relatively few people being able to be a combination of visionary, charismatic, inspiring and truly innovative theologically (or truly innovative in most other areas). There's a reason there are no other Apples and Microsofts out there in the world. It's also a simple matter of those who are that combination of characteristics generally burning brightly for a time and then being extinguished by those who can't handle the glare and/or flaming out for various reasons.
Think about it for a minute:
many people who fit that description lived to be old? How many ended up
diving completely off the deep end into the dark side? How many were
killed just as they were entering chronological maturity?
generally work hard to contain raging fires - both physical and
spiritual / religious. It's just too threatening and unstable for most people to let
them burn, and they often use up all the oxygen and fuel available and extinguish themselves.
3 hours ago