If Gogeta is in DBS: Broly

[LimitbreakerKrillin]

Having Gogeta or UI defeat Broly would be a better alternative than redoing what the original Broly movie did. But if they do bring in Gogeta, I hope they make him appear in his base form first before transforming into SSB

[R. Daneel Olivaw]

Maybe they'll fuse into Gogeta as a last resort but even that won't be enough. Then Goku is put under enough strain he manages to go Ultra Instinct again and defeats Broly with Vegeta's help.
Or maybe this will happen in reverse; Ultra Instinct isn't enough so they try fusion. Maybe Ultra Instinct Gogeta.

[WittyUsername]

Maybe they'll fuse into Gogeta as a last resort but even that won't be enough. Then Goku is put under enough strain he manages to go Ultra Instinct again and defeats Broly with Vegeta's help.
Or maybe this will happen in reverse; Ultra Instinct isn't enough so they try fusion. Maybe Ultra Instinct Gogeta.

It wouldn’t surprise me if they don’t actually defeat Broly at all.

[Logania]

I don't feel like they would bring in Fusion, even if Goku and Vegeta are about to lose and the Earth is destroyed. Their pride wouldn't allow them to fuse against an opponent unless they are also fused, it would feel unfair.

But if he IS in the movie, boy oh boy, my favorite fusion would finally be canon and my fanboy level would be MAXIMUM at the theatre. (Fusion Reborn Gogeta, not GT Gogeta)

But...the english theme for him wouldn't be in the movie and that honestly would suck a bit.

[R. Daneel Olivaw]

I don't feel like they would bring in Fusion, even if Goku and Vegeta are about to lose and the Earth is destroyed. Their pride wouldn't allow them to fuse against an opponent unless they are also fused, it would feel unfair.

I don't think that's true at all. While you could argue that Super Buu having absorbed Gohan and the others counts as a sort of 'fusion' Goku was intent on fusing to beat him and managed to convince Vegeta. Vegeta's character had developed by Super and he was more easily willing to fuse against Zamasu. His bingo dance showed he was willing to sacrifice his pride to protect Earth, and if Goku was willing to use the Zeno button to defeat Zamasu, fusion is fair game.

[Xeogran]

the potarra retcon basically made dance fusion not needed anymore.

Except they don't carry the Potara Earrings everywhere they go.