Pros react to Conor McGregor's retirement tweet

Did Conor McGregor actually decide to retire?
The UFC featherweight champion abruptly tweeted intentions to do so on Tuesday, setting off a firestorm of debate over whether McGregor was serious or just trolling the mixed martial arts world. McGregor has yet to follow-up on his announcement as of this writing, although if the goal was to get everyone talking, he certainly seems to have accomplished that. Check out reactions from the pros below.
I have decided to retire young.
Thanks for the