No one takes Desecration anymore for PvE DPS.  With Glyph of SS, it becomes a rare occurrence for Desecration to be up for any significant period of time.
Idea:
Glyph of Desecration
Minor Glyph
Classes: Death Knight
Requires Level 70
Use: Your Scourge Strike has a chance equal to the chance of your Plauge Strikes to cause the Desecration effect, but your Desecration no longer slows enemies.
This is along the lines of the Thunderstorm and Blast Wave Glyphs, I believe.  It makes the Talent viable for PvE while eliminating its main PvP usefulness.
Hopefully this would give Unholy DPS more variability with their talent points.  Plus, <3 the graphic.