I mingle with some pretty high profile doctors in racing and have talked about this with them since I have heart disease in my family. Nowadays they are focusing on inflammation of the arteries more than focusing on cholesterol, and fat. Although the nitrates used as preservatives are very bad for you and so is the high sodium, which can be counteract by drinking enough liquids when you do eat hotdogs and realizing the amount of salt consumed. It really can't be linked to just one thing because heart problems are the culmination of diet, stress, environment, heredity, a bunch of things.
That being said, I still consider hot dogs a guilty pleasure and bacon ones sound awesome, lol.