#2 Both Conor McGregor and Dustin Poirier have other interesting fights lined up

In the early days of the UFC, when fighting under multiple banners was common and the total roster strength was far less than today, fighters would frequently face off against each other. But now, when the UFC has more contracted fighters than ever, is there a real need for Conor McGregor and Dustin Poirier to meet again?
Both McGregor and Poirier have interesting fights lined up. 'The Diamond' is at the very top of the lightweight division and is slated to go up against champion Charles Oliveira in December. He also has exciting matchups against top-five opponents like Justin Gaethje, Michael Chandler and Islam Makhachev on the horizon.
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Meanwhile, McGregor always has the possibility of a Nate Diaz trilogy to fall back on. 'The Notorious' could essentially pick and choose any opponent he wants across three divisions, unless, of course, the said opponent is firmly in the title picture.
#1 Conor McGregor won't deserve a title shot if Dustin Poirier beats Charles Oliveira

Speaking of fights lined up, Dustin Poirier will get his second shot at the undisputed UFC lightweight title when he takes on Charles Oliveira later this year. Although he fell short in his first attempt, the 32-year-old might be the favorite to displace the Brazilian from the throne.
Should Poirier clinch the strap, it would become next to impossible for Conor McGregor to return against the American. McGregor is on a two-fight losing streak and is 1-3 at lightweight, while other deserving contenders are on the rise. Even a man of his stardom will not be able to talk his way into a championship fight.
Even if Poirier falls short of Oliveira, a fight against McGregor wouldn't make sense. The former champ-champ is barely hanging onto a top-ten spot in the rankings, and his expected spell of inactivity will only push him down further.
Fans wouldn't complain if they got to see Dustin Poirier vs Conor McGregor 4 one day. But it just doesn't seem like it'll happen when 'The Notorious' recovers and returns to the UFC.