Impossible to say unless you are Polaris.
Typically, a company wants to keep failures below 1% during a given warraranty period. I'm pretty sure that the original 2000 800 exceeded that by quite a bit on the crank issue, but they never did any sort of recall or anything on them. They changed the crank pins and such in 01 and beyond to help, but those were just running updates, not retroactive recalls/updates.
Now with the Dragons, Polaris did a recall. Were the percentages so much higher that they thought they needed to do something proactive or were they just trying to be a better customer service company. Don't know.
I'd really be surprised if "blown up" has happened to more than 10% or 15%. But how many have or will have scuffed pistons? If there is an inherent design issue that causes it then eventually they will all experience it.
I know, none of that answered your question.
sled_guy