You might not like D3's story, but you are immediately immersed in it the minute you arrive outside of New Tristram.
highly subjective, i was utterly bored throughout and mainly played to see if something hyped up or changed. it didn't.
linearity doesn't do well in this seat.
the minor choice of bandit's quest in PoE was more excitement than d3 could provide and to even have hostility in party from conflicting decisions was brilliant, in fact it's not even brilliant, that should be a freaking standard by today. All of D3's quest rewards grant next-to-nothing and there is very little choice in what your reward is let alone what they even do(exp+gold... really?) To have a player sit through a linear quest line to only further get linear restricted 0 choices is piss poor pathetic for a triple A game and a big name company.
D2 itself you didn't have to do your quests in order every act or even at all.
PoE has 3 acts, it's a bit puzzling with no background lore and having the player suck everything in the first time in with no prequel or predecessors. If by act 5, when they implement it, and it still doesn't make sense then i'll say the story sucks but as TheCursed mention I did speak with every NPC and watched that text scroll upward with its voice acting between every npc in PoE and so far it's doing a good job with what it has.
D3 has had D1 and D2 to expand on and further that. But instead it seems to have went backwards.
My cousin played D3 first time through he thought the story sucked, this coming from a teenager who hasn't played D1 or D2 so he's pretty uninfluenced. He'd rather go play skyrim or mass effect or borderlands2, he's tried PoE he thinks that's what diablo should be, and I told him to go play Diablo2, go figure.
I just remembered,
PoE's races also already have the no-trade, full self found aspect to it. They've pretty much soaked up that entire market for races already. Diablo3 doesn't really stand a chance at this point in that department imo. That's why I say it's highly unlikely and probably won't happen in Diablo3. Couldn't think of it earlier, was way too tired.
The thing about most players is they compete with their games too even if they play both. The things you mentioned lik endless maps and dungeons and races and ladders existing in Diablo3, sound a lot lik what's already offered in a free to play known as Path of Exile. The only thing Diablo3 is going to receive is a ton of backlash and uncreative minds at the helm running the thing for copying features from games that people who adore D3 that call their rival Pile of Excrement.
The devs themselves entertain themselves with the idea, but any plans for implementation is like dancing around a fire but never jumping into it to extinguish the idea and bring it into fruition. They just like to keep the fire burning and trying to attract as many people in as possible or keep them dancing *like fools.
Pretty much waht TheCursed said, I wouldn't be surprised if what the devs said went through a lawyer before even posting.