I think what Tim Bray did is heroic, I think that Amazon exploited workers way too much, all in the name of thinner overheads and lowering prices, which is the only thing their customers care about.
Tim Bray's resignation won't change things, but if we decide that Amazon's unfair and refuse to patronize them because of their employee treatment, then perhaps there will be change. However, I think there are enough people living paycheck to paycheck where that is a secondary consideration after price, and Amazon does have good prices on many things.
I, for one, will be curtailing my use of Amazon. I only used them sporadically anyway, preferring to support others, but still liked the convenience of Prime for some products. For work, I spend six figures a month with AWS, but there's no employee mistreatment there that I'm aware of.