Hear me out. I just can't see blizzard providing a patch that they say is not supposed to be a DPS decrease with the changes we've seen them make to the glyph of SS, i'm trying to see things from their point of view, which means figuring out the best use of the scourge strike glyph. So hear me out.
Glyph of the Ghoul, Glyph of Disease, and Glyph of Scourge Strike. You take both Reaping and Epidemic.
So our diseases will last 21 seconds. Enter Scourge Strike Glyph (3 scourge strikes) and now our diseases will last 30 seconds. That's 30 seconds that you don't have to use any runes to refresh diseases at all. This saves a lot of runes that can be used for more scourge strikes, which means more runic power. And when you do finially have to refresh your diseases, you just use pestilence to do so, instead of using a Frost and Unholy rune for icy touch and plague strike.
So in 30 seconds you're only going to be using 1 rune to keep diseases up.
How is this a DPS loss to what's going on now? I'm not good at theory crafting, i'm not math oriented guy, this is just a thought that i had.