There could be some significant changes coming to the way Designated Players are used after the 2019 season. According to MLSsoccer.com’s Sam Stejskal, the league is floating the idea of eliminating the third Designated Player spot or putting a hard cap on it, possibly as low as $1.5 million. The changes would likely coincide with the new CBA and start in the 2020 season, and would be accompanied by an increase in Targeted Allocation Money spending.
I've been told by multiple sources that MLS is discussing either eliminating the third Designated Player or putting a cap on how much teams can spend on the third DP.