Since Curiosity is run by a nuclear battery designed to last ten years, it won't undergo the same fate as solar-powered Spirit, exactly. The nuke-battery will die, and it will be anticipated, and the rover will stop communicating & go cold. But NASA will know when that is. With Spirit there was a lot more uncertainty... did the antennae break? software problem? dusty solar panels? etc.
Remember that Spirit was not a failure. Spirit was an enormous success. Her original mission was ninety days. She lasted more than twenty times that. Scientists' careers were stalled for YEARS because the little rover just wouldn't die so they couldn't move on to other projects.
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