It probably won't follow that specific scenario, but I do see Life playing a part this expac. Whatcha mean you don't agree with the Former? I'm certain that's where the plot is headed. Doubt it'll just be a Turalyon and Light alone scenario.
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Why would they shorten Shadowlands? We still have to figure out wtf they're going to do with Anduin, we don't have the Arbiter up yet, the inbetween has still yet to be explored, and we don't even know how the Drust plot's going to end. Hell, we're not even on 9.1 yet. We got a LOT of time for 10.0 man, trust me. And if Blizzard has to break the 2 year rule for it, then so be it.
Also, regarding the Sepulcher, pretty sure that's why we're going to Korthia.
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Which is funny. The Jailer just randomly takes a long lost land of the Shadowlands and brings that shit to the Maw. Mf really just said "I WANT THE SECRETS NOW, FIRST ONES! BRING THAT SHIT OVER HERE!!!!!"