I do not appreciate GSP style that much, but I will miss this guy around if he really decides to retire. All the power to him if he wants to, even with the controversial "win" over Hendricks.
GSP is all commitment, hard work and respect. Overall I consider him not only one of the best athletes of all times, but also the far best personality in MMA. And if his style does not please everyone, his opponents, some high level SOBs, certainly had no answer to shut it down.
I will provide the excuse I saw for him for the last fight: I think Hendricks edged that fight, but I also think GSP's head is going through performance debilitating issues. He wasn't as concentrated as in other times. Ok, maybe JH was too strong for him, a better wrestler, whatever, but that's why I would like to see the rematch.
Win or lose, I think this is the fight to make and possibly (and hopefully), that will be GSP's announcement in this coming conference. Hendricks rematch, then retirement win or lose.