If the current RAM supply crisis continues, it is very likely that these kinds of offers will disappear and that systems like this will become more expensive as well, not to mention all the other products that rely on DRAM components.
I also don’t believe RAM prices will drop again anytime soon, especially now that manufacturers have seen how high prices can go while demand still holds. Unlike something like graphics cards, RAM is not optional, it is a fundamental requirement for building any computer (or any device that contains one). People don’t buy it because they want to, but because they have to.
In the end, I suspect that some form of market-regulating mechanism may be required, potentially through government intervention. Otherwise, it’s hard for me to see what would bring prices down again, unless Chinese manufacturers manage to produce DRAM at scale, at significantly lower cost, and effectively flood the market.