So could this be a reason? Could the fact that so many do indeed get away with it be a factor?
It's hard to say. Let me propose that most cheaters actually do not get away with it. We see here where people divorce the cheater immediately or after some reflection.
Then, there are the betrayed that reconcile with the WS. But, they aren't getting away with it, using my situation as an example. I don't consider us reconciling yet, either, but I sure as hell wouldn't want to be on the receiving end of what he has had to put up with from me, POSOW, or himself. For reconciliation to happen, the BS needs to see action and commitment and if the WS is remorseful, they end up so deflated that they can't even look at themselves. I don't think that's getting away with it...
Last, there are some cheaters that are allowed to stick around for the reasons you stated. Again, though, are they really getting away with it? The cheater now lives with someone that can barely stand them just for the sake of said reason(s). The cheater is now the one being used.
I have absolutely no stats or references, just submitting some thoughts.
Considering the thoughts above, I am wondering if not getting away with it is not the reason for the upward trend but rather it more relates to the answer to the following question:
Is there an arrogance, a dismissive attitude that tells them that chances are good they won't lose everything?
First, yes, they are extremely arrogant, but it's not about losing anything, it's way more simple: they don't think they will get caught. With all of the new technology available right at their fingertips, it makes the communication, lies, and build-up soooooo easy and because you can "lock" and "hide" such technology, cheaters convince themselves that they will be able to keep it a secret forever because of the perception of secrecy and protection.
And to offer one more thing, no WS could ever understand the devastation this causes until they actually live it. So, whether or not someone else "gets away with it," whether or not someone else is outed to every person in the world, it would not matter. I don't think anyone can assimilate what will actually happen. It doesn't matter how many movies, books, documentaries, friends' stories, etc. that you are exposed to, no one gets it until they live it. I never realized the trauma this causes the BS until I became one. I always had sympathy for others' situations, but damn, I was completely blindsided by the aftermath. I think many not directly exposed to it simply think, "Yeah, WS had an affair, BS divorced them," and they think everyone moves on.
No one has a fucking clue.