Miss I. - "Maybe they need less boob mojo?"
While sarcasm is hard to convey in print, that comment has to be. I'd guess the standard cup size in Hollywood is 'A', with a few 'trainers' and 'Bs' - ie; well below the threshold of boob mojo. Moreover, almost every female figure (if you can call them that) on screen have boy-butts, also called 'Juniors' in women jean sizing and refers to prepubescent hips. While almost everyone - men, women, lesbians - love a fine rack and rockin' curves, gays don't.
The absence of female lines in Hollywood, like the abundance of metrosexual males and leading losers, is from excessive 'gaying-up' by Hollywood's elitist, creating a disconnect with any customer not taking it in the tailpipe or with an eye for beauty. One prime example is the female lead in the Twilight saga (marketed at gays, adolescent girls and tools) is close to the ugliest actress in Hollywood - selected either to make the male lead more attractive or because that's the subconscious view gays have of women. Likewise, fashion designers flaunt their anorexic, marionette view of the idealized woman while the sight of such makes most people gasp in horror.
No, if there is something Hollywood definitely needs more of, it's Boob mojo and ladies with female figures. But that's still a far second to what Hollywood is lacking most among actresses - the ability to act. I did a quick check of the top-grossing and top-researched actresses in 2011, and only two are good at acting.
All the rest of the actresses are type-cast filler, extras or eye candy that Hollywood 'makes do' with instead of trying to produce quality products. But when it does come to quality; While neither the above is 'hot' - attractive is a better term - and have zero boob mojo going for them, in the same way Christina Aguilera makes up for lacking looks with awesome pipes, these two dominate scenes with overwhelming ability rather than outstanding appearance. Unfortunately, there are currently no hot actresses that can act, and so no surefire female leads to pack box-offices.