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Porn has a discoverability problem. There's very little in the way of curation, so the success or failure of a scene depends largely on what search keywords it matches.
It's well-known in the industry that there's a hinterland between "teen" and "MILF". A lot of performers in their late twenties struggle to find work, because they don't fit into either category. It's not that women in their late twenties are so grotesque that nobody would masturbate over them, but just because nobody particularly searches for that. There's no conspiracy to normalise incest porn, it's just that the industry found some previously under-served search terms. In a year or two, the industry will have moved on to the next set of search terms.
The prevalence of extreme acts is purely economic. If you want to watch two normal-looking people having normal sex, you can find millions of free amateur videos. People pay for what they can't easily find for free. This isn't a question of greed - the porn industry is huge, but it isn't terribly profitable due to the huge amount of competition.
There's also a demographic skew. Middle-aged white American men are by far the most likely to actually pay for their porn, so the output of the industry is heavily skewed towards their preferences. Women make up a fairly large proportion of porn consumers, but almost never pay for it, so they're massively under-served. It's likely that this has become a vicious cycle - people who don't see their preferences represented in porn are less likely to pay for it, so they see less content that's aimed at them, which they're less likely to pay for.
The current trend in the industry is towards ultra-niche content. Making a video that appeals to an extremely specific demographic can be much more profitable than something with more general interest, because people will actively seek out your content and pay for it. Many independent performers make most of their income from one-to-one cam sessions and personalised videos, because piracy and tube sites can't directly compete with a video that's made for just one person.