Reminds me of that Robot Chicken parody where Jar Jar dies and stays around Darth Vader as a force ghost.

Because if anything, Aruto is annoyingly eternally positive genki idiot with Humagears

I actually would like something like that. Aruto becoming some kind of firewall AI/Zea for all the humagears with Izu somehow. Like the exact opposite of Ark. Ark symbolizing all the humans bad aspects, destruction and all, and Aruto being the positive side.

Fukuzoe could finally be the Hiden president with Shesta as secretary, we would still have a rider force with Yua and Fuwa at AIMS to protect the city/country.
Yeah I would like that.
Aruto wouldn't be around but could still come back temporarily for crossovers thanks to magic powers (like "hacking" a vanilla humagear body or something) a bit like our Fruit Jesus Lord.

Do we think Saber will make an appearance at all in the final episode? Has any post series movie been confirmed?

I kinda wish we could get a 1 hour final episode. Just feels like a lot needs to happen to wrap things up.

I agree. Honestly, I don't normally like the idea of ending the show on a cliffhanger and concluding the story in a movie, but it might be a good if Zero-One did that.