As a Twink I'd KILL to be capable of doing all Quests in all Zones with my 10's or my 70, etc. Blizz HAS the technology and we know for fact it works, all they have to do is leave it on all the time. This would open up so much potential with WoW.
The only people that would care about this are currently in this thread.
In fact, I'd argue that doing this would further WoWs decline. One of their biggest problems is an extremely fragmented world that doesn't feel complete or whole.
One if the big appeals of vanilla, BC and even wrath was that the story and lore felt well cemented in a fully realized world through which content flow easily.
And cata both continued that but also started to fracture that. It changed the world, so you could see where past actions in previous expacs had actually had an effect. The world had moved forward with the story.
But cata was where it also started falling apart. It's hard to simultaneously keep older content around when the story moves on. MC makes zero sense right now. Why do BRD and MC still exist, from a story standpoint? Aren't the dark iron our friends now? Refreshing dungeons like deadmines and sfk and SM was cool, so why didn't all of instanced content get that refresh?
And then further expacs and experience squishing just made alot of that old content obsolete. Hell, entire expacs can be fully skipped, but their storylines are referenced in quests and dungeons that you experience while leveling. With no resolution.
If you're a new player, nothing makes sense anymore. At least not from like level 55-110.
WoW needs another full reshaping ala Cata. The world needs to make sense as a whole again. There needs to be a concrete sense of progression through stories. I'm 100% sure that players feel disconnected from the game because there is no overarching, complete story anymore. It's just a bunch of different chapters all written by different people who may or may not have read the chapter before theirs.
/Rant