[Dyrakro]

Ok, so let's see:

Last year I already thought about how "funny" it would be, if Toei would introduce a Rider of a future series in a current one.

That aside:
Hopefully Oma Zi-O stays the main villain of the series.

And currently I'm thinking about what could happen during the show. Like Woz fighting at the side of Sougo at first just to betray him later on and become Oma Zi-O himself. Or maybe realize that Sougo doesn't want o be his appreciated master and he tries to find a new Lord.
Would be interesting too, if the future Riders themselves appeared. And as Sougo tries to change the timeline they find out that there is no timeline with their existence as long nobody becomes Oma Zi-O. Or in general they can't exist, as long as Sougo is alive.