I pretty much did the same last year. I was able to roll over about 23,000 MQMs.

I hit Silver in January. Gold in April. Platinum in July.

23k MQMs Rolled Over
10k MQM Boost for $25,000 Spend (Skymiles Platinum Card) -
77k MQMs earned
= 110k MQMs and $3200 MQDs

Have a trip next week that'll give me another 5500MQMs and $700 MQDs leaving less than 10k MQMs and $2500 MQDs before hitting Diamond.

Had I earned those 2000 miles last December, I'd have hit Platinum this past month, but no chance at Diamond.

Though I've had so many Monday or Friday travel days that I'm hardly ever getting FC with PM.