First, they are not ALL failing.
Second, I seriously doubt, young or old, you know someone that has went 150k miles without ever changing the oil.
Third, if you want people to respond to you then use a real email address instead of a disposable hotmail address. Only the naive will take one of those seriously.
Fourth, who do you plan to sue regarding the 2006-2009 engines? That company no longer exists and the new company was absolved of product liability issues.
Yes I do know people, young and old that have gone 150k miles without ever changing oil, just adding whenever they decided to check. Chains have failed before and after warranties no matter what oil change routine was followed. I use that hotmail address because i do not want emails coming through my business email address and dropping into a spam box or getting automatically deleted. I have responded to all of the people that have emailed me and asked their permission to have an attorney contact them. All have said yes, and by the way, there were even hotmail addresses in addition to several gmail addresses.
That is my full name, it's not a disposable email address, and I have had it for well over 10 years.
The problem is still going on. I bought my vehicle in 2010 from GM, I did not purchase the vehicle and then shop for an engine. Whether or not the engine manufacturer is still in business or not is not a concern. I already went down that road when I did my investigations and asked the same questions. After speaking with a law firm and the attorney, GM is still culpable regardless of the product liabilities (absolved) of the engine manufacturer(s). That will all come out as well. I went round and round with GM when I first had the issue. I own a Traverse, and like every vehicle I have ever owned, I take meticulous care of it, front to back, top to bottom. It is not a normal situation for timing chains to stretch out due to dirty oil. Before all the quick change oil stores open, most people had no clue when to change their oil and we were not replacing timing chains as is the situation with these vehicles.
If you have no problem, consider yourself lucky. The rest of us have the problems and there is no guarantee that it will not happen again. I even asked the question when my own chains were replaced, and the service center manager only said, "it shouldn't". From what I have read on all the forums with these engines, the problem is ongoing and keeps occurring.