I don't think waiting until people decide they can tolerate 16:10 or 16:9 would be a good strategy. Thinkpads were some of the last laptops to offer 4:3 models, and people were buying them for that reason. They already have premium prices and a reputation for quality; I think if anybody was going to do this, Lenovo would already be doing it.
In any case, I'm not saying it's fact, just loose speculation