Interesting article. I wasn't implying that it is likely that your opponent will take you to the ground. I was just saying that if they did choose to take you down, especially if you weren't expecting it, then your aikido techniques will not be very useful in that particular situation (based on the techniques I am aware of). But still, 60%-90% of fights seem like they go to the ground based on the studies.
You could also argue that your Aikido knowledge might help prevent you from being in a fight in the first place, or at least put you in a favorable upright position once the conflict starts. There a lot of different sides to this.