If the incentive to work at McDonald’s decreases to a point where they either need to raise the wages or automate large parts of their process, won't that lead to a possibility where McDonald’s ceases to exist or becomes a luxury item?
It's not very unlikely that they won't be able to automate their business and the only option is to raise the wages. With raised wages they will need to increase their prices.
They won't need to raise their wages though. BI takes care of the minimum amount to survive, and McDonalds wages provides "extra" money. BI essentially takes over as the "minimum" part of the minimum wage, and low wage jobs become a lot more attractive (than they are currently).
It's not very unlikely that they won't be able to automate their business and the only option is to raise the wages. With raised wages they will need to increase their prices.