I don't see why not. They're MMA figures not UFC figures. It doesn't look the UFC is even involved. Do you think he's lost poularity, because of inactivity? Even if he has I'd think he would still be more popular than Tito, or Matt Hughes.
I just jumped the gun and assumed Zuffa had rights to the figures.
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Diablo III Battletag = Hordack#1465 WoW - Ghostlands Sever XBL Gamertag = Hordack1980