This is a stupid idea. Making the Falcon the new Captain America I’m ok with, but this is stupid. Marvel has always had really strong female characters. Wasp was the captain of the Avengers for a long time, and in the X-men, at least old school X-men, you have Jean Grey (Phoenix), Shadowcat, Storm, Rogue, Psylocke, Mystique, Emma Frost...
How about they just write good stories and not crap that is just a vehicle for them to draw woman with enormous boobs in string bikinis running around with swords.
If you look at comics from several decades ago, you will find that the female version of Thor storyline has been done before.
Marvel has plenty of female characters and some of them have sold fairly well. The problem (and this is the same over at DC) is that if an upstart new creation starts to eclipse established characters considered to be the core of the brand then upper management has awful plot developments intentionally inserted to reign them in.
Oh wait...that's Miranda Frost.
Never mind.
Given that Thor is a god to those of the Aesir cult, this is about as offensive as the “arteests” portraying Jesus as a “Lesbian womyn”, which truthfully I’m surprised they haven’t done after depicting him as a raving homo.
The funny part is that this is guaranteed to be a flop, because women and girls are not their audience, and never will be. They might as well sponsor a “George W. Bush standup comedy at the Apollo”, as far as misfires go.