The plan is to continue having full expansions for the next 10 years. We are essentially starting fresh with a "Season 2" in 7.0, that will be setup throughout 6.1-6.5. Yoship as far as I'm aware previously said that he didn't like capping off levelling at 100, so it is likely to go beyond that unless they plan to do a level squish later on.

I agree that for the time being they should steer clear of too many nebulous supernatural elements and instead focus on laying the groundwork in a Heavensward-like expansion where our new main cast and villains are introduced. 7.0 is not the time to go planet hopping again or to have a "void" expansion. Stuff like that should mark the end of a story arc, not the beginning of one.