Nice derailing, as this is clearly not the topic of the argument here.

The replacing will happen in due time - be it with amazon, be it with every other big warehouse. But that does not allow amazon till then to pay his warehouse-workers way under the trade-agreement, that is binding for this kind of industry in Germany.

Amazon says it does not have to pay the trade-agreement-wages from the mail order business, as it is just a logistics company. And that is the whole reason of the strikes. So the union is pushing for strike, to bring amazon in line with the other mail-order-businesses in Germany. So that its workers might one day earn the same amount of money, that every other worker in this industry earns already.

An intermediate stage would likely be an increase in the percentage of goods drop-shipped from China (I've already received several Amazon items this way in the US)