I don't see how Warner Bros. has been afraid of the Wonder Women property here. If they truly were, they'd stop spending so much money on it. (Though, in recent memory, the only attempt that has gone into production was the failed pilot, the cost of countless screenplays can't have been cheap).
Their behavior doesn't really seem all that different than the way they treated Batman after the failure of Batman & Robin
in 1997 (with several aborted attempts before Nolan's reboot in 2005), or Superman between the last Christopher Reeve movie and Bryan Singer's version in 2006.