I think it is the other way around. The decline of sales by the gpu manufacturer will only mean that the prices of cryptocurrencies could not keep up to the miner's expense that is why they don't see gpu mining profitable anymore. The decrease in sales of gpus does not mean that the bear market will still continue there is no point on connecting that, it just simply mean that the prices of cryptocurrencies and the block rewards they are getting is simply not appealing or profitable for them to still continue. Or it just simply mean that all the willing miners out here possibly are satisfied with the mining rigs they all have and has no plans of buying additional hardware anymore, especially when the new RTX gpu series of NVIDIA is about to launch.