I don't want to talk about Machida vs Jones inparticular, but about deaths in MMA.
I tell my friends that there could be a death ANY night in the UFC.
Several people have died already as direct results of MMA, and there is no imaginary safety net that leads me to believe the UFC won't have to deal with that type of situation at some point.
I'd hate to see it happen, but I wouldn't be that surprised to see a guy like George Roop, or any other Joe Shmo 6'3" 145er shut off permanently one of these nights.
The bar is only getting higher these days when it comes to skill level in the UFC. One mismatch, one headkick, one late stoppage, and someone can DIE.
If you think it will NEVER happen, you're much more optimistic than me. With the number of fights we get to see these days, barring a miracle it's going to happen sooner or later.