Sure we did. We KNEW Sargeras was going to be a thing in the future, dare I say even near future. Of course, Azshara was expected to come before that, but we knew of the Burning Legion coming back in full force. Wrathion even hinted at that happening in Mists of Pandaria. You can't say it was unexpected when we have evidence for it in the game itself.
Death expansion was also known as soon as we knew about concrete evidence of the Shadowlands, especially it being detailed in Chronicles. That was absolutely on the table, and was being talked about as far back as ~6 years ago; if not further. Shadowlands was already established as far back as the RPG books, but it wasn't made official again until Chronicles.
I'll give you Draenor though. WoD was a complete outsider expansion, and Blizzard could definitely give us those again. However I will say that WoD also was the expansion that gave us nothing - no new races, no new classes. And we know the details of how they came about to this - Mongrel Horde, dead Chieftains being back to life by a magical warhorn - none of this stuff can really be predicted so honestly, I'm not banking on new races and new classes being added from such an expansion coming out of left field.
Just because 'Tinkers of Tinklandia' is possible doesn't mean I'm going to value it as a merit towards Tinkers, know what I mean? Tinkers have plenty of other factors behind it pointing to its potential. Mechagon relevance, potential of Undermine, the themes connected between Gnomes and Goblins left unexplored through a class to represent their major NPCs, the Island Expedition 'Engineers' who use abilities that Gazlowe had in HotS, etc. Plenty of actual material we can talk about without considering the 'what if'.