I always feel like I'm the slow witted one in these threads. Are you saying that getting to your feet is not a viable option even if it is what you are trained to do? Hence training to regain your feet is a flawed practice, and people should be training to fight on the ground?
I agree fights take on all shapes and sizes, and outcomes.
first, the ones who DON'T feel slow witted are probably the ones causing problems!
Seriously, I don't get that impression of you at all and appreciate that you asked a clarifying question, rather than jump to the wrong conclusion.
Regarding your question, that's not at all what I am trying to say. If anything, I'm saying that training in a style like Judo, BJJ, Sambo, CaCC Wrestling, Folk Wrestling or some other legitimate grappling art is, IMO, the best way to train to stand up. In other words, the best way to ensure that the fight remains standing is to train as a grappler. If you're not training from the very worst positions against people who are trained to keep you there, you are not learning to stand up, even if you are walking through the techniques.
Situation 3, as outlined by Kung Fu Wang, is where your opponent throws you or takes you to the ground, and then decides to follow you to the ground. In other words, in spite of what training you might have or how effective your instructor told you your anti-grappling is, you are on the ground. Oh crap. And he's on top of you. He's sitting on your diaphragm, keeping you from breathing, and he weighs a metric ton. What now?
If it sounds bad, that's a good sign, because it IS bad. It sucks. It's uncomfortable, and it takes a LONG time to develop the coordination and skill to regain guard, defend yourself, disengage and regain your feet from under mount. In my opinion, if you're not AT LEAST an experienced blue belt in BJJ or equivalent in some other legitimate grappling art, you just don't know how crappy it really is, and are in denial if you think that your techniques will work against anyone with any training.
When a grappler discusses ground fighting in a self defense situation, the grappler is GENERALLY thinking about the third scenario, where you find yourself in the worst case scenario, mounted by a bad guy. Did you want to go there? No. But there you are.
When some martial artists, and we all know them when we read their posts, refer to ground fighting, they insist on referring to scenario 4, where you choose to lay down and yell, "Get in my guard" to a bad guy. As though anyone thinks this is a good idea. It's a reflection of their insecurity, in my opinion.