Welll, you have to understand that there's no way to give a definitive answer to a what if like this. You're asking for a prediction on something that's highly individual, and very difficult to find research on to back up any opinion.
Like, I'm kink friendly as hell. Anything between two consenting adults is fine by me as long as I'm not expected to be enthusiastic about it. So it isn't uncommon for people to end up sharing (over sharing many times lol) details of the how and why of their kink with me. When people find someone that's either open minded, or at least doesn't judge them based only on their kink, they almost need to open up about it.
It's this whole thing.
But scat? It's so far outside my personal limits that it's difficult to keep composure when it comes up in person, that even when I'm saying I don't judge them based on that, my face shows my strong dislike of being pooped on. I used to be a nurse's assistant, so I've been pooped on way more than is fair. It's hard not to at least wrinkle my nose, you dig?
Which is just me explaining how little good information on the subject of scat fetishes and fetishists there is. There aren't a ton of published articles. Everything is essentially anecdotal. And even my anecdotes are limited, and I've had necrophiliacs plural open up to me about their fetish.
That's a long fucking disclaimer lol.
So, my opinion? You wouldn't see much of a shift. There's already ways to reduce the smell of your feces, and make it worse. So the people that have a strong preference about the smell of it as relates to their kink can already have their poo cake and eat it too
But that's still only so useful as an opinion because while I would have to take off my pants and have a buddy standing by to count the scat fetishists I've listened to about their desires, the buddy wouldn't even have to take off their shoes. Sorry about that, I've been waiting for the chance to use that description, and it's perfect for this.
The "good" news? If you hunt around and keep an open mind while being civil and non judgemental, you can find scat fetishists online with a bit of patience.
If you're interested, I can go into detail about what I've been told that leads me to have the opinion that it wouldn't change, but it's kinda gross to most people, so I won't go into it without a request.