K, considering that 9.0 will be like 9 months away at Blizzcon minimum, plenty of people will care about 8.3. Also there is no real argument to say they can't do a big patch content and announce the expack at the same. Do you think the same team works on live content versus future content? We can have a raid (likely a smaller 5-6 boss raid due to anniversary raid at the same time) and an expansion announcement. Announcing MOP did not ruin the enthusiasm for Dragonsoul, the duration of dragonsoul did. I think you fundamentally don't understand the playerbase if you think people will ignore 8.3 if 9.0 is announced....like what the hell are they going to do until it releases???
Timeline, 8.3 and 9.0 announced at Blizzcon to make a big WOW presentation. 8.3 live by January, 9.0 live by July, expansion Aug/Sept.
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While i have mixed feelings on the Shadowlands leak, the fact that they proved they can encrypt stuff and it not get spoiled prior to launch definitely tells me 8.3 is going to have a lot of major bridges to the expansion. Regardless of which expansion we get, 8.3 is going to push us to it.