We've already accepted the fact that we will go down.
I reject that as a given. I accept that probability is high of an "off" but it is not a given. I am at 16 track days and no offs (well, not off the bike anyway, I think I've had three off-the-tracks :-)
If you want to race, and you have a target/deadline, then I accept that you will need to push limits more quickly and that will increase risk of an off. Also, the fact you want to race means that you need to understand where the limits are for you and your motorcycle, and that will almost certainly involve an off here and there.
But if you are simply a track-day enthusiast, there is no reason that (by your own hand) you must have an off. Ride within your limits, take your time, follow the group captains' and the trackday manager's advice and you'll have a great time with no offs.
The times I went off the track were my fault. And yes, I was following my own advice when they happened, just had three brain farts and lost concentration. But those were early on and I practiced discipline and improved.
The only times I really had a scare were caused by other people riding recklessly. Which is why I always skipped the session when they open it up for passing (when in Novice group). I figured by the end of that session Darwin's theory would have prevailed and the worst of the lot would be nursing injuries - or if no injuries then by the next session they were more comfortable with their bikes and able to best contain themselves.
All I am saying is that yes you should have a plan for an off (what if bike is messed up, what if you are messed up, etc.) but don't focus on it. Ride within your limits, have fun, and think of 'offs' as something that happens to other people :-)