Movie Review Channel Doomed?

I'm about ten videos into my movie review channel at the moment. I've gotten feedback that if I want to grow, I should really find a niche of films to talk about (aka stick with a genre and gather interest from other fans of that genre). I personally don't want to do that at the moment as I want to watch and make videos on a wide variety of films coming out- but I understand that feedback and it makes total sense. Should I not pursue a more broad "movie review" channel? Or should I narrow down and try to grow a niche of specific reviews?