TLC NAND can hit roughly 20cents per gigabyte right now, I wouldn't be surprised if it could be done cheaper via stacked, it's still not going to be cheaper than mass produced optical discs though.
But... Load times of 300MB/s with 1-2ns access times is VASTLY superior to the PS4's 27MB/s and 180ms access times of it's blu-ray drive. (That's 180,000,000 ns)
It would allow for streaming to be very feasible.
300MB/s transfer rates is also 2-3x faster than a mechanical Hard Drive, which is something you won't get out of cheap TLC NAND+controller set-up.
Though... On the bright side you probably wouldn't need a hard drive if you were using 300Mb/s Flash as the storage medium, provided each "cart" had a few gigabytes of extra storage for extra content or something.

Also Discs aren't tied to a resolution.
You could do 4k movies on a regular 700 Megabyte (Aka. PS1) compact disk, unfortuntately... You would likely have to compromise on bitrate and run time substantually... And no commercial hardware players would be able to read it natively, you would need a "Smart" device to do so that can already output at that resolution.
In short you don't need a 100Gb disc to do 4k, it's just marketing buzzwords that you have grasped onto. A 25/50Gb Blu-ray disk using h.265 for 4k video would be sufficient for most people.

My dream for a few years now has been a physical transportable, reloadable media sort of like a cross between thumbdrive harddrive and tomagotchi.
Like, imagine going to gamestop and instead of buying a game it just loads onto a customizable thumbdrive in the shape of mario or something. I think that would be pretty cool. Like, you could probably make an amiibo line like this. And instead of buying the game on disc, you could buy it on an amiibo. Or bring one of your own and load it on.

Ah one can dream.

I think if Nintendo Is going to support physical needs they will use cartridges.

The format that a game comes on to me is about the most boring thing about games.

Like who cares. It will be exactly the same game no matter the format more or less.

It's not like the 90s where cartridges vs CDs were a huge difference in the end game experience.

Cartridges/ license could be solution, Cartridge with a part of games program and a part will have to be download after, Cartridge whose be cross plateform.

Won't happen. They cost too much, plus, who can ya fit a 50gb game, onto a cartridge?

You realise that USB thumb drives, if bought in bulk, from say made-in-china.com have 64 GB USB drives for 3$ a peice.

They are selling them at 3$ to stores, than then sell them onto consumers for a much higher price.

I bet you anything, that if they are selling them a 3$ a peice, the actual manufactureing cost is probably somewhere around 1.5$.

Now theres probably cheaper ways to produce a cartridge than how USB thumb drives are made.

I wouldnt be surprised if you could get manufactureing costs down to under 1$.

^ this is a 64 GB thumb drive.

Definitely possible, there are good chances that NX will have cartridge (type of memory card) same like 3DS has.

Btw here is a transparent usb drive, from Polytro.

Look at how small that chip is. They say they will make 32 & 64 gb variants of this.

People say how would you fit 64gb onto a cartrdige?

JUST look at it... its frekking tiny!

One problem. Well. More like 3.
1) Endurance.
2) Read Speeds.
3) Write Speeds.

In order to increase Endurance you want some spare area and some good firmware, meaning you need more memory, better controller.

For higher read and write speeds you need more memory chips in parallel to extract more performance, then you need a memory controller that can handle that, that drives up the price considerably.

Otherwise you might end up with a drive that only lasts a short while... With 10Mb/s Read/Write speeds, slower than bluray, meaning any effort was for naught. (And it would still cost more than stamping plastic discs.)

All well and good to use a USB Flash drive as an example, but it's not going to be the same thing.