I agree, doesn't matter what u use, you still have to change it. Even ELC, if you think I'm going to leave it my truck for 500,000 miles your crazy. I'll probably change it once every couple years. Same think happens with Dexcool, supposed to last 100,000+ miles so when the car gets to that when its 10 years old the coolant is crap and sludged up. You really need to changed based on time.
Remember the old green stuff.. supposed to change that about every year.