DRAM has followed Dennard scaling but that has slowed just as it has for logic. https://semiengineering.com/1xnm-dram-challenges/

I don't know why you would expect a 6T SRAM cell to ever be smaller than a 1T DRAM cell given that both of them are scaling. Also, DRAM die sizes appear to be 40-80 sq. mm which is smaller than processors. https://www.semiconductor-digest.com/2019/09/13/dram-nand-an...