The idea that one could look at a person's genome and make realistic predictions about their health prospects and the likelihood any of a vast array of different diseases was really sold in the early days of genome sequencing, but I always scoffed at the idea.
Well the SNP-based version has not worked out. But I'm guessing the full-sequence version has a better shot in a decade or two. Commonalities between identical twins raised apart of course provide the limit to which this project could ultimately succeed.