They already do participate and it isn't a huge amount of work either. Patreon, YouTube subscriptions, KickStarters - they all represent people making a choice to support creative output without gatekeepers. Same happens with live entertainment, to a degree, the culture industry doesn't take mad blind punts on complete unknowns - mostly it brings in those who've already built up a following of some sort. They pick up on what people have already invested time, effort and attention in. Whats more both of those manifestations exist in the private sector, they require even more work given that offering that support means financial outlay.
Democratic models of content are already more diverse, independent and exploratory - the internet exists. That a wider range of people than would ever have been possible in a trad model have access to the tools to create and share content without gatekeeper involvement is already a fact, not an ambition. The question is more how to take advantage of that potential and how to fund the creative industries than whether it'll happen.
As it is that creative expansion is being left entirely in the hands of the private sector, advertisers and the ability of any single creator to push their own funding sources (like Patreon). Sure, if you want to talk about the platforming of nutters and Fash that's a great example of where a gatekeeper free model can go wrong - Far Right voices get near infinite funding for their grift, churning out videos, books, podcasts and whatever else through social media. Left wing ones, absent any real funding (and often expertise) of their own have a far lesser reach. Provide a democratised model of funding and there would be some greater balance in that. People could organise and push for representation without it being contingent on wealth. The BBC gatekeeper model on the other hand will give you Owen Jones being argued at by a Tory once a month and label it fair and balanced.
That said I don't view any model as a panacea. Opening up democratic access to the culture industry won't amount to a utopian landscape, but then a gatekeeper model certainly hasn't done that either, it's given us lots of Farage and Johnson.
And one last thing - culture and news/journalism are two distinct things, two different industries - I no more think people should vote on the news they get than the BBC should choose it through politically compromised gatekeepers and editors. News should be objective and factual, nothing else. British journalism is another huge topic in itself though.