The problem with bows, as I and several people I know see them, is their rate of fire.
People are suggesting that maybe the new bow tree can speed up the firing rate by taking the alacrity cap off the animation to make using bows competitive with throwing weapon builds.
I've been thinking that what makes throwing weapon builds (alchemists and shuriken/dagger throwers) useful in end-game content are the feats that grant always-on Doubleshot like Simple Thrown Expertise and Shuriken Expertise. These two feats allow throwers (depending on class or race) to throw a lot more missiles than bow users can currently shoot.
The obvious simple solution, it seems to me, is to add a similar feat (call it Bow Expertise) that adds a bunch more Doubleshot at all times. You might have to modify Manyshot a little bit so that it's more inline with the chance of an extra missile that 10K Stars and Multitude of Missiles grants, but I think that would be a reasonable action to take.