I think the warrior glyph that just buffs their aoe is a dumb glyph. I think the blade flurry glyph you list would come along with blade flurry being nerfed by one target baseline.
Your spree idea is actually interesting. How much of a penalty would a rogue be wiling to take on to make it a single target move? You would probably use the glyph on Garalon (you would not have to move out any more to just hit the leg). You wouldn't use it in pvp if the debuff was worse than about 10%, but if it was 5 or 10 you probably would, if you pvped as combat. I think 30% is too much for most uses, but that's an interesting thought experiment.
Your glyph of dispatch idea is just a flat buff and therefore sucks. Here's what I mean:
On a Patchwerk, there is some percent of increase that dispatch could gain that would make up for the loss of blindside. I don't know what it is, and neither do you- you just guessed with 50%. Lets say that it is definitely worth taking. In that case, the glyph is mandatory, so all muti rogues take it, and our rotation is more boring because of it. Additionally, we have a monster execute phase. The only fight you wouldn't take it on is a fight where the boss gives up at 15% or something- and even that would be made up for if the buff was large enough. OR lets say that on Patchwerk it is NOT worth taking. In that case, no rogues take it, except for fights that emphasize executes. It's only interesting in pvp because you trade one kind of burst for another.
The problem is mostly about what do they want from glyphs - they SHOULD be an additional layer of customization for our gameplay, but in the end they are only some cosmetic features with a couple of mandatory ones.
Making them dps increases, cd reductions and so on won't solve anything, nor make us more enjoyable. There will be some theorycrafting and in the end everyone will use the same 3 glyphs because they provide the greatest dps increase.
All glypsh should be about utility like CoS, Feint. I like the idea of BF glyph, hitting more targets but reducing damage to make it not mandatory.
We already have bad talents which basically give no choice - i don't want glyphs to be the same way (even if now they actually are).