Radio exposure was a limiting factor after the first wave of prog as well. Now that teens and young adults are getting their music from non-radio sources, it removes the most restrictive filter that kept them from even considering non-"mainstream" music.
On the other hand, there are other ways that things are different now.
Although never a user myself, I've surrendered myself to the idea that drug culture of the late 60s and early 70s fed into and drew from the imagery and inventiveness of the most creative bands of the time. It's probably pointless to even imagine a "Tales" or "Lamb" show without a thick marijuana fog. To say nothing of the creation of the albums in the first place. So much of the music that's still most revered owed a lot to the conjunction of fresh young brilliant minds with hallucinogenics. (It shouldn't be a surprise why those minds aren't making worthwhile music any more).
Moral judgments aside, there would need to be a monumental cultural shift or some mind-opening catalyst of that sort to get the mass populace out of the sing-along mode that keeps them strapped to brief, 3-chord pop (including Mumford and Sons). Otherwise, "progressive" music will be left to the few, the proud who appreciate art with higher aspirations. And those who make make progressive music will continue to do so not with stars in their eyes, but out of a compulsion nobody around them gets and that they don't quite understand themselves.
So no, I don't think the HuffPo pundit's opinion is good for much.
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