In the Spring of 2012, former UFC Heavyweight Champion Brock Lesnar made his return to the WWE, much to the delight of WWE fans everywhere. In the six years since the "Beast Incarnate" stepped back into the squared circle, delight has given way to frustration. It's not hard to find the source of the WWE Universe' displeasure with Universal Champion, it boils down to one simple issue: He's never here.
Since making his return, Brock Lesnar has competed in a grand total of 46 matches on WWE television (Monday Night Raw and various PPV events). To put that in some perspective, Seth Rollins has competed in 37 matches... so far this year.
Now normally Lesnar's part-time schedule wouldn't be an issue. Many big name WWE Superstars- especially those who have found success outside of the WWE, work part-time. They come and go as needed, and their appearances are a special treat for their fans.
The problem in Brock Lesnar's case is that, to quote his advocate Paul Heyman, he's "the current, reigning, defending, undisputed" Universal Champion. For the last 500 days, since WrestleMania XXXIII, Brock Lesnar has essentially removed the Universal Championship from the equation. That is both bad for the WWE and the WWE fans.
With the announcement that Lesnar has begun the process of reentering the USADA testing pool, it's clear that his intention is to return to the UFC. He would still need to serve out the rest of his one year suspension for failing multiple drug tests after his UFC 200 fight against Mark Hunt.
Source: CC: BY-SA, Miguel Discart (via Flickr)
This means his upcoming match against Roman Reigns at SummerSlam could be one of the last times we see the founding father of Suplex City in a WWE ring. His suspension from the USADA would be complete in January of 2019, this means that the last PPV Lesnar would be available for would be TLC in December.
It's far more likely that Lesnar's last match would be at one of the four major PPVs (The Royal Rumble, WrestleMania, SummerSlam, and Survivor Series), meaning that his last match would probably come at Survivor Series. This is assuming that the WWE decides to shell out the nearly $700k per-match fee Lesnar would be entitled to under his current WWE contract, or if they decide to try to work out a new deal altogether.