Dragon Ball Super General (WARNING: Massive spoilers inside)

Seasonal anime weren't that popular in Japan, but now we're getting to have more seasonal anime compared to even a decade ago and it has been proven to work. Attack on Titan and My Hero Academia for example have proven it can work and the audience in Japan is willing to wait to get more of the story when making a ton of filler with these types of anime were more common until the manga got further ahead. Perhaps if a reboot was to do well in Japan that it could work. The series can handle Goku being the main focus while giving other characters screen time. Dragon Ball Z had Goku late to the fight or sidelined for most of its run while saving him for the big or final fights and it worked well for Japanese audiences. Were Toriyama failed was not keeping the side and supporting characters up to speed with Goku and the Saiyans, since he mostly kept giving Saiyans more and more quick power ups to justify them getting so strong on Namek when there was no time to train.

A reboot could still keep Goku as the star, while having the other characters gain focus. The key is really coming up with good stories for them or giving them great fights that will keep the audience engaged, which is a big appeal of Dragon Ball. For example in a reboot it is possible Chichi could be made into a more serious fighter with her no shit taking personality intact to add a new bit to her relationship with Goku and that could go well or bad depending on how the audience takes her fights. If she has her own style, actually allowed to win fights, while having a strong personality or even a hot and cold style with Goku there is a good chance she would do well. Those are usually fine with viewers or readers with female characters. If Yamecha and Krillin the punching bags of the western fandom were reintroduced and given a fair shot at keeping up with Goku they too can get fans approval. If the fights are still great, but more story and character interaction I think a new Dragon Ball has a shot of succeeding. People seem to like the slice of life moments in Super, so I think people are willing to see the other characters. If we got stuff like a revamped Freeza that still has the same personality, but we actually get to see his people and home planet more, which can retroactively make Cooler canon and develop King Cold more to add something new to the fandom that they may really get them on board.

It might not work at all and bomb I admit. I do think a rebooted universe just has more of a chance to redo or expand on Toriyama ideas. The universe doesn't have to be empty so that bigger threats and grander adventures can grow organically.