Hi Mark,
I mentioned DVD as an example of tech that was a clear leap in tech quality, yet still took a decade for joe consumer to consider. There are many other examples. Three years from exotic to mainstream is *really* fast.
If people bought cars with money as the overiding consideration, anything other than a Honda Civic or a Toyota corolla would be a rare bird. People *easily* spend twice as much on cars as they have to. That is the discretionary part

R2-E2, 2G Prius.
Highway/City/Husband/Wife MPG:
56.5, as of 12/2005, 26K miles
Jac Nasser, Ford President: "We are planning to launch a hybrid version of
this car [P2000] within this year [1998]. We will also make FCEV available in
2004."