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NASA currently has Mars sample return as their priority flagship mission not just for this decade but for the next one as well. They were recommended to do this in the 2012 decadal review. It is good for geology, nobody doubts that. But it is motivated mainly by the search for ancient life on Mars.
This story has recently hit the news. I think it is reasonably clear he was not putting forward a serious worked out future plan for Mars. But is there any potential in the idea?