use them
It was not to long ago - in the 90's when a RT business ticket to Europe was 60,000 miles on most carriers and now they are typically 90 - 100,000.
I use to hoard miles, but in light of how easy to are obtain, devaluation will continue. NWA's rule buster awards now don't even give you open availability.
I keep 200,000 in NW as a minumin, so I can always do a RT to Europe at no notice, but have used over 1,000,000 miles in the last 12 months giving to family, friends and using them.
Still have 800,000 AA orphan miles...waiting for the day I can use on BA to LHR from DTW