Not necessarily so.
My experience is that it kills off the ones that think they are entitled to heaps of money solely on the merit that they post video's.
I've seen channels grow heaps because they post interesting content, have their individual style and have the patience to actually grow their channel and put some effort into it. Some incorporate the sponsor adds delicately. Some put those adds in the video in such an intrusive way it is actually funny and becomes a feature on the channel. You need some talent to make good YT video's and survive. Most of those channels don't actually need the extra income from the commercials during/around the video's.
