Anyway, if not, this should definately be something someone should do, i'm kinda surprised a year on no one has attempted this yet but hey ho, i guess other things are more tempting.
I know you can easily turn them off, but thats not the point, as we all know a vast majority (if not over 80%) of the quests in game, literally can't be done without a marker, like the mages guild quest where which says:
"Urag gro-Shub is looking for writings by the Arch-Mage Shalidor, so that he can translate them into something useful for the College. He's asked that I attempt to find another copy for him."
Jee...i'd LOVE to but, where on earth am i suppose to go? I would never in a million years thought it was south of riften (where the quest marker takes you) lol.
But hey ho i suppose one can dream. I'd love to see something like this, even if it was just for the main quest and the guilds, i realise that would be a lot of work, but i suppose if you kept the extra info to just the journal entry updates, you wouldn't need to worry about extra dialogue.