Personally, I hope we get more than two Riders. I don't need as many as Gaim or Ryuki, but I'd really like to have 3-4 main Riders throughout the whole series, maybe with a few minor Riders who show up occasionally. Maybe it's because my first two Rider shows were Agito and Ryuki, but I like having a larger hero cast in a modern Rider show. Mostly, though, it has to do with my biggest fear for Drive:

After Gaim, I really, really, really do not want to see the next Kamen Rider series backslide into the Den-O pattern again: two Riders (one goofy and one serious), non-human sidekick who at least appears to die in the penultimate episode, monster and victim of the fortnight, and goddamn two-episode arcs with very few ongoing subplots. Gaim has been a great breath of fresh air after a period where the show was beginning to stagnate and I do not want Drive to go back to the status quo.

Well Gaim was really really really successful and Heisei Rider history has shown us that toei and bandai will always try to catch lightning twice. So I bet you Drive will be alot like Gaim structurewise.

The Status Quo you described was there because Double was insanely popular so Toei and Bandai did Double four times in a row :lol
Same with the onslaught of Multi Rider shows in the early 2000s when Agito was a giant success. Even Kiva tried to copy Den-O after that show was so popular :lol

Yeah, I am really hoping that, if nothing else, the Armor Change to sales have convinced Bandai and Toei that there are financial incentives to continuing in this new direction.

Multi Rider seems to sell really good right now after we only had two riders per show the last four years. Fourze and Wizard toys didnt sell all that well from what I heard so yeah, the next one should be closer to Gaims model.

I don't want Rider to go back to the two parter format either but we don't need Drive copying Gaim's format.

I know early Heisei had similar structure but it didn't feel obligated to include the same plot points of previous series in the same format like I felt Wizard did.

More than likely, judging from past seasons, this season will be another 2 Rider format show. Main and Secondary. Which is fine with me. What I'd like to see though is something akin to Kiva. Where you had Kiva, Ixa, Saga, Dark Kiva, and so on. More than two Riders but not so many you lose track of who's doing what where and why.

Nothing should ever try to be more like Kiva in any way ever.

What I'm more worried about is the 2 episode arc format returning. Number of riders I prefer to be in the 4+ area, so I am hoping for that. But if blatantly stretched out 2-part stories return man that will suck.

Everything should be Kiva.

I'm hoping that died with Gaim.

I think a number of Riders somewhere in the Faiz/Agito/Blade area would be fine.