also, depending on the size of the company, i think women CEOs need to take on some atypically aggressive and assertive business characteristics that are unbecoming of either sex but are typically more acceptable in society for men to step into.
could a woman be the next Larry Ellison? certainly yes, but not without first taking on his asshole qualities. the aggressive characteristics that make him a great multi-$bn CEO also make him a pretty hated guy in many circles. there's a difference between business-respect and personal-respect, some people don't give a shit about the latter and will step on their partners' throats to get ahead.