If you watch the movie johnny mnemonic, they throw around data cubes the size of a stamp. Modern nvme ssds weigh around 4 grams per TB. So we've already achieved scifi movie parity :D. The only problem is the price.
I'm a little bit old. When I ordered my first M.2 drive, I had never seen one IRL. I'd assumed about RAM-stick size. Nope! Thumb-sized! The future is amazing! So... give it enough time and eventually the mundane will scratch that itch, I guess?