Agreed, with one important counterargument.
Jumpshooting teams throughout the course of NBA history have almost always been run and gun teams who didnt play a lick of D.
Think the 90's Warriors, the Suns of Nash, the Mavs of Dirk-Terry-Stack, the Warriors of Baron-SJax.
It's a rare combination to have a team that is strong defensively but offensively relies on outside shooting. Most great defensive teams have power post games like the Spurs do or the 3peat Lakers.
At the end of the day, Defense is the single most important component of basketball in terms of winning in today's NBA. You can get by easier on off-shooting nights as a perimeter team if D/rebounding are constants.
And even though I pick LAL to win the West, this is the one problem I see for LAL. The Defense has to be shored up a little bit. Bynum would be a tremendous part of this, but the more time goes by and the more the timeframe for a return gets prolonged, the more I question what exactly his role is for the 2008 postseason.