It’s not known yet how Sony will come up with file system and software side of things. Who says games will get bigger?! Let’s see how that works together with what type of ssd and so on...
to many unknown variables for now to conclude something, I guess. We can predict though!
I suspect they will put the SSD on the motherboard as will give better performance in theory.
But there is absolutely nothing stopping them from putting an M2 slot on the motherboard for additional storage if required.
I know I am speculating about game sizes, but there are some games out there requiring huge data these days.
These are all PC sizes and will give a better idea of next gen storage required.
Red Dead Redemption 2 - 150GB (I am 99% certain Red Dead 2 will be re-released for next gen, just as GTA 5 was. They apparently have improved all the textures for the PC version + greater draw distances - The PC version of Red Dead will no doubt appear on the PS5)
New Star Wars - 55GB
Call of Duty Inifinite Warfare - 70GB
Many others are over 50GB, and Cyber Punk will probably be 80GB+ also, and games will only get bigger - Although I am hoping that the next gen will allow developers to improve AI and physics as they will no longer be restricted by a CPU designed for a Netbook.
I could be wrong, but 1TB will not last long and 2TB is too costly and will put the price of the machine up too much.
But then how much are people willing to pay for a next gen console.
Personally if they get the specs right would happily pay up to £500, as would rather have a few better components and pay £100 more than have another PS4 where they used 2 year old mid-range PC tech and a netbook processor.