OP

Quoted from Zitt:

This is a very slippery slope.
Think of the Homebrew community... a Retheme would no longer be considered FairUse because it's based upon the geometry of the original PF. Now this is all "mute" as long as the Homebrew doesn't try to go into production... but they could easily get an enforceable C&D in the mail.
While I understand the desire to prevent copycatting or "Style theft"; it really isn't an good argument that this having Dr Seuss sue them based upon it. If they win; it'll have far reaching implications across the board.