Chevy needs them all - they all serve a different customer.
BTW Toyota has:
Matrix
RAV4
Highlander
4Runner
Sequoia
Siena
4 door Tacoma
and in the same showroom the Scion xA and xB
and Ford has:
Focus wagon
Escape
Freestyle
Freestar
Edge
Explorer
Explorer Sporttrac
Expedition and EL
Still haven't figured out why Ford and Chevy can't build competitive minivans, seems like they would be able to