I don't think Blizzard would be able to pull any decent housing even being optimistic about the game designers. The workload needed to make it work after multiple expansions and the amount of time they would need adding more elements to the housing system has little chance to pay off. Either the games comes with housing early on integrated within the base game or it doesn't.
So, even if they added housing, I don't think it would factor in my decision of coming back to WoW, though I technically never "abandoned" it to begin with as I usually tend to go back and forth. I got things I like/dislike from each game.