Nostalgists best start stocking up on hankies: Detroit auto makers are getting ready to give the boot to two of the nation's biggest, and oldest, luxury car models. Say bye-bye to Cadillac's Eldorado, right, and Lincoln's Continental. The vehicles are victims of America's love, affair with sport-utility vehicles, changing market demographics, and political and economic pressures to improve fuel economy. Ford is expected to curb the Continental and GM to idle the Eldorado in the late summer or early fall of 2002. They will be replaced with models the car makers fervently hope will better stand up to the European and Asian luxury brands.