Blizzard should release content a bit slower paced during expansions mainly to avoid the 12 month drought that happens after the final raid tier.
Wrath, Cata, and MoP have all suffered from this. Whereas TBC had Sunwell and a few months later Wrath came out.
Blizzard most likely won't be releases more content per expansion, which is why they just need to slow down on the raid tiers earlier on that way the final tier doesn't need to last a year, but rather no more than 6 months.
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