You brought up and interesting point, Tampa, but I think the technology available today plays more of a part than anonymity.
Today all a guy who wants make some money sexually has to do is get a webcam and a room, and he's set. He can entertain an audience, it doesn't matter if it's girls or guys watching, and make money.
Straight guys aren't going to gay-for-pay studios anymore because they don't need them. Just get on
Chaturbate and enjoy yourself while you get paid. If you're lucky, an agent may like you and get you into straight porn. Gay-for-pay is going away for the same reason manufacturing jobs went away. Technology.
I don't think this will be the end of studio porn. Studio porn's attraction is that it provides fantasy, just as it always has. But for fantasy to work, you need an audience that is willing to use their imagination. It may be difficult, but if
Broke Straight Boys can find gay or bi guys who are at least straight acting, then they'll do well. I have no problem with that at all. But then, I like fantasy.