Generally in rich countries, it is not "the society" that covers the cost. For example, government does not give money to grocery stores to create ramps and accessible bathrooms—they fine the stores that don't have them. That's the core of accessibility regulations in rich countries, like ADA in the US.

The difference between rich countries, the government forces the businesses to accommodate people with disabilities at the cost to the business. In poor countries, at least the one I came from, they leave it to the businesses to make that decision themselves. The result is that in rich countries are much more accessible than poor countries.

I don't know if your model (where "the society", which I guess means the government pays for this stuff) is tested in any jurisdiction. If it has, I would appreciate a link to an article about the results. But the model where businesses are forced by regulations to cover the costs works very well, as evidenced by how accessible US is thanks to ADA.