This is a major downgrade for the centurion card. One of the reasons I upgraded to centurion was the 1.5x points. Now, however, it is possible to receive 40k bonus points after spending 40k on plat, but only 50k bonus after spending 150k on cent. If you "only" spend 100k, no extra points for you.
However, due to recent enhancements, platinum does not have the possibility to book hotels from amex hotel collections. This is something that centurion has, and may be enough to keep me onboard. I already called in to confirm if I get the unused part of my annual fee back if I quit my membership.