Not to mention the fact that he is going to lose the meme war big time. He's taking on reddit and 4chan. ha ha ha ha
Pepe is a subversive meme used by people who getting an anti-authoritarian, anti-SJW as well (but to a far less degree) by the racist Alt-Right.
Legal action against pepe is only going to make it stronger - like the Streisand Affect on steroids.
If Matt Furie thinks this will stop the use of Pepe he's a fool. If he's doing this to separate himself from Kekistanis others who have adopted Pepe then ... whatever. No one will link the two,