I doubt it because a lot of the things were done to please the audiences.
- Bringing every veteran back was done for this very purpose.
- So was Ridley's addition
- Battlefield forms AND hazard toggles were heavily requested things.
- Etc.
Fan demand won't be the only thing though. In fact, Inklings may very well be an example of this because Splatoon's success combined with how confident they are of the franchise shows that, even without demands, the squid kids earned their spot.
But it's not farfetched to assume that the ballot is gonna play an important part in some of the new additions. They have some results from it, why only use it for a single character (Bayonetta)?