The Diamond League is like an abused partner who thinks, if I just appease the abuser one more time, they will come around and treat me better. It doesn't work. SML has completely disrespected the Diamond League and World Athletics in general, yet they just broke their own rules and invited her to their big party anyway.
I think we will look back on this as the time when the Diamond League started to decline. Maybe the Michael Johnson league takes it place, maybe something else. But it just sold its soul and sent a message to all other athletes - it doesn't matter if you faithfully compete in lots of Diamond League meets and accumulate points. We'll probably just give your spot away to someone with a bigger name.