People eat up certain genres in all mediums regardless. This is why the film market is saturated with terrible horror movies, sequels and reboots, animated television is just comedies or slice of life, etc. Webcomics unlike the rest is a niche which essentially screws everyone over because trends never die, ever in miniature indie spheres. This is kind've what makes it unique from the rest.
I think this is why there are so many terrible webcomics that have a massive fanbase compared to other mediums which have varied fanbases. Theres no real way to move onto something else or compare because you're not given alternatives because webcomics are so super nichey. Webcomics don't get commercials on tv, webcomics aren't promoted outside of the sites they're on and rarely if ever do comics get the fanbases that are up there with mainstream media. I'm not going to even mention traditional printed comic people, because that's a clusterfuck in of itself.
I think it's possible to give exposure to good creators... I don't think its possible to change what is already set in stone with webcomics. Unless webcomics can become as big as other mediums, I kinda fear this is something that will rarely ever change.