Makes me think of Marcelo Alonso on a SRN Roundtable back in the day. They asked him how Chael Sonnen was received in Brazil -- did he have to worry about his safety, did people yell at him on the street, etc. He said, "Of course they boo him in the arena if he's fighting a Brazilian, but on the street they love him. He might be one of the three most popular fighters in Brazil right now."
I have the feeling that McGregor might be similar. At the end of the day, he's a charismatic guy and a good fighter and they want to see the star. Who knows, maybe even Colby would fall into this range, but Colby is nastier than Sonnen ever was, less clever than McGregor, and not nearly as popular in the U.S. as either one.