Also, mutiboxing being a minority thing doesn't really mean heroes shouldn't exist. Maybe that's why it's going to be more expensive. It might not be as common anyway given the expense.
On the other hand, it's the vision Ankama has for the game. They want the game to be about that. They want it being a fundamental core feature. So they likely want everyone doing it, or as many people as possible.
I think that the game should be designed based around heroes. We should stop thinking about how heroes will hurt the current game, which isn't really designed for heroes. And we should start saying: how can the game be designed better for heroes? You know, rather than: let's remove heroes!