I'd respectfully beg to differ. If you're good, if people are digging you, they have more ways to find you than ever before. Colbie Callait and others including Tristan Prettyman have all been online stars before crossing over (in some cases over 1 year) into terrestrial airwaves.
Is there a biased towards unknowns? Sure, always has been. If you were a PD or MD and had everyone and their mother telling you their record was the next best thing you'd be gun shy too. Hell, you wouldn't even have the time to listen to it all because someone's releasing some song every five minutes.
Radio is and always will be a uni-dimensional tool and can only serve so much. With the advent of new technologies comes the ability to get yourself exposed on wide levels or.... never make it all. There's no guarantees in life as an artist and to just think you deserve to be heard and have records sold is kind of arrogant.
It's a rough biz and sometimes it's not a fair one either but as an artist, it's the one an artist chooses to pursue a dream, not a guaranteed job with a salary. There's a pot at the end of the rainbow for some and others, just a bag of coal.
And as someone who listens to a ton of music a week, i can tell you that being a mult-dimensional broadcaster and exposer of the product, the technology field in which we're in offers them a better chance than an industry with one dimension to reach people with.