Software can filter your 46.5661287 exabytes of pictures to guide you to the ones that are most interesting. Besides, what's important is relative and could change with future events. For example, a rather casual photo of Bill Clinton hugging Monica Lewinsky was just a throw away photo when it was taken. But after the scandal broke it became worth a fortune.
http://www.worldsfamousphotos.com/2008/10/15/bill-clinton-hu...
In conclusion, photograph all of the things and worry about analyzing it later.