Chael Sonnen has been in the bright lights and has been one of the main stars of the UFC before. He is very familiar with the way things are going for McGregor and Sonnen knows how long these types of things last. Of course Sonnen was not on the same level as McGregor, but Sonnen has been in a similar position as McGregor.
In a recent video, Sonnen talks about all the bells and whistles about a fighter and knows that the spotlight is only temporary. McGregor is the main face of the UFC right now, but has not said the best things about the company as of late. McGregor is more focused on a boxing match with Floyd Mayweather rather than defending the lightweight belt after taking out Eddie Alvarez.
On the next page there is the video with Sonnen explaining the price of glory and how long it can last. Sonnen uses great examples from the past and brings up just how powerful the UFC is.
(click on page #2 tab below to see the video of Sonnen warning McGregor about the UFC)