I hear that Wrath changes are all finalized and that the sky is falling.
Seriously, unless conclusive numbers have been run on raid mobs in Wrath (they haven't been) then you are just a few months early with whining about that particular issue. Also, frostbolt slow has never worked on raid bosses themselves, so what do you care about the slow portion for anyway?
See our Wrath whining sticky if you have any other well thought out complaints like this to offer.
What exactly is the point of speccing frost if the glyph just turns your main spell into fireball with a different graphic? Because using a water elemental is oh so fascinating?
The whole reason for the spell to even exist is that it slows the target. If you take that away then you might as well take the snare away from frost nova and increase its damage, take the disorient away from dragon's breath and increase it's damage, take the life draining from drain life and increase it's damage etc
Not to mention it's just a boring glyph. If they're going to remove the slow they should make it do something else rather than just more damage. Perhaps it no longer slows, but has an increased chance to freeze the target or an additional chance to proc fingers of frost, or put up a free ice barrier or something a bit interesting that is in keeping with the frost tree.
The kind of things I was looking for were, "Your cone of cold no longer slows, but now knocks back targets 20 yards." Something to really distinguish your mage from others and open up the possibilities of a different type of gameplay.
I don't see what anyone would get out of speccing frost over speccing fire if they couldn't even kite. I mean surely everyone knows that frost does less damage than fire, but the reason they spec frost when raiding is because they want a different type of gameplay outside of the raid. So if you're a career raider (the type of people would take this glyph, because people doing 5 mans, PvP and soloing certainly wouldn't), then why would you even spec frost? Because you think blue is prettier than orange?