Ha, what I meant by the standard response of "try it" is that the MMA practitioner is very experienced in making their "standard takedown" against people trying to stop them, by sprawling and hitting them as they come in, and as a result, their "standard takedown" isn't anywhere near as easy to stop as you seemed to be implying. Add to that the basic biomechanics that, if you are sprawling enough to stop the takedown then your weight is in the exact wrong direction for any real power in the strikes you're describing, or, if you're upright enough to get something into the strikes, then you're going to get taken down pretty quickly.
Mm. This assumes you Sprawl. You only need to keep the Person still for a second - They are the one lowering themself to attempt the Takedown.
And that really starts to get into the heart of Stealthy's question - although there are weaknesses that can be exploited (and no, I'm not giving those away here...), when you look at a system which is performance driven, the practitioners get very good at making sure that they can make things work. And that tends to lead to "good" habits, in this regard. Defences are tight, offence is direct and powerful, changes in range are smooth etc, and the rules aren't really limitations unless you decide to see them as such. With all the rules of forbidden techniques listed, who says that a self defence situation will go much past the first punch?
Very True
Really, the strength of MMA is it's training methods, and they are not to be taken lightly (for the record, although I haven't trained in MMA myself, I have trained in similar approaches in a few arts, such as BJJ and boxing, and a number of our seniors have been, and in some cases still are, cross-training in MMA, which leads to some very insightful conversations). And that training method can generate certain issues, but nothing that I would describe as a potentially dangerous (to the practitioner) habit. Some maybe less advised, but that's really not the same thing.