I personally think that enough Jedi have died already......
Take into consideration they've been fighting the Vong for 2 or 3 years now.....
And before then, the Jedi had a different perspective on the universe and the way things work....
Add to that, they were almost all but wiped from the galaxy....
The Jedi's view and approach, whether through conflict or contemplation should've resolved this war long ago....
I think the authors didn't want the general public to feel the Jedi were invincible, when I believe they could've resolved much within the first year of the war....
Author's point made*
The Jedi should wipe out the Vong in the final two books