Dragon magic is the strongest magic and if it were more realistic none of the current classes would actually be anywhere close to thier power, jaina could wipe out whole cities herself and dragons are a power beyond what even she holds.
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Nothing you have suggested could be considered a good thing, player housing is no worth putting into the game because it would then sacrifice content because blizzard cant give you extra features and content at the same time.
You cant prove feedback has resulted in anything blizz have put into the game at all, they only listen to the top guilds during world first races and then the rest of the time you will be ignored, players/customers give bad advise plain and simple so its pointless.
There is nothing flawed in having a race/class be limited to that one class/race, it actually makes the game better and follow actual lore, everything you have suggested is a terrible idea.
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And we still dont know if he made more than one or not, doesnt matter the intention what matters is the result.