You are exaggerating the Rabbids hate, a lot.
If you hate them, it's OK, but don't lie.
They are very popular, much more popular than Rayman, probably, lol.
Do you think Nintendo, a gigantic and succesful company , is stupid or something?
If they put their most important icon with these characters in a crossover, it's for a reason.
The game will definitely not flop, because it's a freaking launch Mario game, a RPG Mario game and has Minions in it, I mean, Rabbids.
Those things were enemies and now they have their own games and even a TV show.
People like my mom or my friends that don't know about videogames knows what a Rabbid is, but have no idea that Rayman exists.
People who say Rabbids are garbage that will ruin everything are probably just nerds that just liked Rayman and are jealous about the Rabbids's success, a.k.a. salty hardcore fans that probably represent like 10% of the sales.
That's my opinion.