I don't agree that attaching disposal's real costs to products will significantly change things.

Disposal really is cheap. Some things are improperly disposed of today, sent to developing countries instead of properly landfilled or recycled. But the cost of doing it properly is still very small, and hardly enough to merit restructuring manufacturing to a less-efficient method.

I don't know what you mean when you call this a cause for "a lot of the issues that we experience in society today." But it is definitely not better for the environment to use less efficient manufacturing schemes.