Yes, the maximum number of Medallion Qualification Miles (MQMs) that can be earned each year with the Delta Reserve card is 30,000. (rewardexpert.com)
The changes affect the upgrade window as well as where SkyMiles members with Medallion status will be placed on the upgrade list. (frequentbusinesstraveler.com)
This process has now been automated for Silver Medallion members. (thepointsguide.com)