Yea, I get their thought process and I know the public might not respond well to a light-hearted F4 film.
But I would pay good money to see a F4 movie that could perfectly capture the wondrous spirit of what the title has always been about: family, love, exploration, adventure. Not "Urgh! Life is hard so I'll fight bad guys and save the day in the next 100 minutes urgh!" :/