Thematically speaking I think blades makes more sense as an enchanter buff > mage buff > wizard buff, but I also think its probably fine on Wizards.
I do like the idea of mages having a quested pet at 65 rather than a relic, or at least before a relic but I also have no idea about the power difference in a 63 mage pet vs a relic pet so maybe a mage could chime in on if that even matters.
I like the idea of Wizards either having their murk spell changed to a long duration semi-reliable counterspell/reflect penetration chance, as it is now on mobs that reflect/counterspell a lot it gives you the chance to do maybe 1/4th your normal damage between its duration / recast timer. As it stands now I don't think murk quest is even worth doing for a wizard. I like the idea of a long duration version of it that maybe gives you 50-65% chance to ignore reflects/counterspells. Around half your normal damage output on a mob that reflects/counterspells is pretty valuable compared to how it is now. I guess the few mobs that do reflect/counterspell this much are kind of balanced around the fact but it would be nice to be more useful in those situations.
With that said I think my favorite idea is just replacing the murk spell with a raid evac. It would be desirable to do the quest, and if its cast time was something like 30s it could be useful for when you need to evac an entire raid but don't have an evaccer in every group. With a long cast time it would have fairly limited application in getting out of wipes (outside of warriors using NOW) and it would just save some hassle.
My actual favorite idea is making the murk spell a cold based abstraction, but I think a raid-wide evac is more realistic because wizards are already really good at AoE.