When the frame rot issue was
When the frame rot issue was settled, Toyota, to its credit, stepped up and supported all of its pickups affected. The settlement gave owners new frames or repaid them for work already done. Not many automakers do this -- unless they are told to by the court -- which makes Toyota's support so much more commendable.
Let's look at something, though, age. The original suit in this was filed sometime in the 2009-2011 timeframe. It became a class-action lawsuit sometime in 2013 and was settled in 2014. The provisions of the settlement go back to the early 2000s. This means that, even with warranty extensions, some of the trucks are getting long-in-the-tooth, putting some of them at better than 15 years old. I think this is more than enough time for Toyota to provide support.
I can see 10 years of support; 15 years tops. That's more than enough time. Why, automakers usually only keep about 15 years of parts on hand for older models, so 15 years would seem to be a good time for the automaker to back away. Some might even argue 10 years is more than enough time, but, Toyota's problems began in the early 2000s and there are some vehicles still out there that are a tad newer out there that may need the automaker's TLC (or a new frame), so those vehicles should be supported. . Just my opinion.