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That is really beside the point. First, it's unlikely that almost ANY creative endeavor will 'pierce the mainstream.' Very few writing projects are successful, VERY few.
But if you want to make comics, you can make comics. 'Subculture' is by no means purely diminishing. Punk was subculture, rock was subculture, hip hop was subculture. Until then one day, it wasn't anymore.
People are reading this very differently from what I'm saying. I'm saying if you want to make comics, the tool to do that is the same tool you are using right this very moment…it's Tumblr. No other social media has the same tools, pool of talent, and audience.
Start small. Beware of scope creep. Find your voice.
But the tools are all there.