Actually the only change they've ever made is to expand it.
When we first purchased in 1993 you could bank 100% of your points, but could only borrow 50% maximum. This would give you a maximum of 250% in any one year: (bank 100%, current 100%, borrow 50%)
Shortly after they changed it so you could borrow 100% also, and it's been that way ever since.
It's never been suspended.