Demystifying ultimate and savage

[ItMe]

Unless they announce three Ultimates next expansion, they're cancelling one.

Technically no.
If the next expac has two raids, it's because one of 6.x's 3 ultimates got pushed back to 7.x, which in turn is probably pushing one back to 8.x.
And this is all assuming that they don't plan on dropping Ults to 1 per expac like how we've been getting less dungeons, etc. too.
But just because something is getting pushed back doesn't mean something else is getting axed to make room for it.