If I recall correctly, Tommy Andreasen did mention back in summer '18 that a cross-over is coming that will "come out of left field".
I've personally been hoping for a Chima crossover cough, cough,
but I would certainly be onboard something with something like this.
Whenever Ninjago wants to bring some sort of "other-world", they do it with one of the 16 (or 17) parallel realms. When this umpteen-number cap was defined, we only knew of five. In the three story years since then, they've only added four additional realms. So, at the current rate, it will be a while before the cap is reached, but it still lingers.
Clutch Powers could open up the possibility of other planets out in space, within the same universe as Ninjago. This would also free up the writers to introduce bizarre worlds without the concern of running up the realm count.