I cancelled after nearly 11 years because I think it will suck.
I've seen the no flying content blizzard has cooked up. Vanilla travel sucked and TI style content wasn't good any of the times blizzard tried to push it into the game. No way I would support it now given blizzards "we don't know what the "F" we are going to do stance so we'll just see what gamers do. So just wait and see."
Blizzard can't be decisive on flying and they want me to believe they can fix other game issues? I doubt it at this point.