It's actually $3000 this year. I'm sure DL is probably fine with a Silver with $2000 in MQD and $25K in AMEX spend vs. a Silver with $3000 in MQD. However, I doubt a Diamond with only $5000 in MQD makes up the difference in margin with $25K AMEX spend vs. a Diamond with $15000 in MQD.
I know. I used last year's MQD requirement (for status this year) to make the numbers easy.