Zeta is a great platform with a large future, just not for Commodore.
It is heavy for a unitary body (monocoque) design because it needs to be tough for Australian roads and conditions. People are forgetting the GMC Denali XT Concept. GM not only needs to make it's cars smaller, lighter and more economical, it has to do the same with trucks and SUV/CUV's.
While there is a role for FWD based CUV's, these will become smaller and lighter over time. But there will also be a role for a lighter but tough new generation of RWD based trucks and heavy duty SUV/CUV's. This is where GM will likely exploit Zeta now. But this will follow the more urgent small car programs and after GM stops bleeding red ink after 2010 or now 2011 if their cash burn allows.
