I think in the next few years you're going to start seeing a lot of manufacturers rolling back on all of these factory water thin oil recommendations. GM has already done it, because they are experiencing an unusually high failure rate with their 6.2L, V8. They've gone from an original factory spec of 0W-20, to a 0W-40.
They're certainly not doing this because 0W-20 is a more, "stout oil". They're doing it because all of these water thin oils lack the necessary film strength to provide proper protection under high temperature / high load conditions that many of these vehicles operate in.
This whole water thin oil bandwagon has come about because of government CAFE mileage standards being shoved down these manufacturers throats. Now that this is starting to cost the manufacturers money, instead of the customers, because of in warranty failure rates, they're going to do something about it.
Losing money on CAFE credits is far cheaper than multi billion dollar in warranty engine replacements.