That is a good analysis. I think it ignores the obvious components that the conservatives are well funded precicely because conservative dogma is all about protecting the owner class. Wealthy business people are not going to fund efforts to impose progressive taxation, mandatory sick time etc.
Sure there are rich people in the arts who lean liberal at least in public, but they are outnumbered and out-spent by capital owners.
The left will never be able to spend as much on communication so the approach has go be completely different. Using the products of capitalism like social media has been effective. Peer-to-peer organizing is slow but costs little. Tacking pro-worker policies onto the platforms of the otherwise pro-business Democrats as a differentiator has lead to some success.
Reaching the mass media reach of the far right is so difficult to do without the capital backing though. The left really needs to get into the talk radio game. NPR tries but they are inevitably quite centrist.