Usually the argument of this people is mostly: in a delfationary society, the economy would collapse cause people would indefinitly postpone their purchases. I often answer that:

• every human has basic needs that needs to be satisfied (home, food, energy, transport)
• some part of our economy is already deflationary despite high levels ofmoney debasment. For exemple computing hardware get cheaper years after years. But did people wait 10 years to buy cheaper the Iphone from 2010 ? No because the opportunity / cost ratio of buying the new iphone each year is viewed as superior than just waiting few years more to have it at a discount.

So in short, a deflationary society don't crumble because people stop consuming. But the 3consumer society" that is so critisized will collapse, cause people will learn about low time preference and its benefits.

Finaly, for the salaries matter, I can imagine a society where salary stays stable more than decrease. It would be a normal thing to have a constant salary, and as all prices around are decreasing in Bitcoin term, this can be considered as a promotion to reward fidelity and experience through time.