You're trying to rewrite decades of economic theory in a single comment. You can just Google "deflation great depression" and "elasticity of demand". Think about the opposite side of the coin. You have car that is ok but want a better one. The better one costs $35k. In a few months, it will be $30k and a few more $25k. When will you buy it? Deflation is kryptonite to consumer spending.
I'm not rewriting anything, this is called time preference, a well-known concept. High-% deflation happens to consumer electronics all the time. You get the same product much cheaper or a better product with the same price if you wait. Still people buy these products, because they want / need them now. Sure, the rate of inflation / deflation will shift the average time preference, but it's not that drastic and doesn't cause a spiral.
