16 out of the last 22 MLB MVPs, NL and AL combined, have been infielders. Eight out of the top 10 AL and NL MVP vote-getters were also infielders. So it has clearly been determined that the need for a good infield is not something to be shrugged off as a nice gesture.
This slideshow is going on current rosters. Not last year's statistics, not official projections for next year, but clearly an assessment of how the teams' infields look now.