Yeah i thought about that too. My PC already had 8GB of RAM in 2009 and even today that is still totally fine for most games. However, consoles usually share RAM between GPU and CPU though and high end PC GPUs today have up to 8GB of VRAM which will only increase once 4K content becomes more common place, so something like 64GB shared RAM for a supposed PS5 does not sound so outlandish as it may seem at first glance.