I have drug every peg 'curb feeler' on every new bike, and any used bike that still had them...I never understood the point of them.
Short or long, they just scraped bad, I unthreaded them, and then eventually put on aftermarket rearsets.
I have seen a few broken stock peg tips on other bikes, and All were a result of the bikes falling over, it took the weight of the bike to snap them.
I suppose that you could hit something on the road, or a crack or groove that would grab and break them, but it wouldn't be common, as the pegs fold and usually my boot would scrape whenever the pegs drug the road.
I honestly would not give it a second thought anyway.
I drug my stock Gen2 mufflers on the road several times, and their bottom sides were scratched up alot from it.
There was also an egg size and shaped scrape on the clutch cover area of my lower right fairing(there are pictures of this in my old threads here somewhere), as the right side of the engine sits out a little further than the left, because of the clutch.
Now dragging hard parts on the roads is never good(but spring loaded legs don't really matter, as they just move up and out of the way, kind of an early warning), and I was just learning the Busa's lean limits as I drug knees.
But I say all that as proof that the curb feelers are unnesacerry, and nothing to worry about.