I think part of the appeal of high capacity cards is that you spend less time fumbling with cards. A 1TB card would probably last an entire day of shooting HD video. As an amateur photographer, I generally keep 2 extra SD cards on hand but they're backups and not used. I don't think I've ever filled up the 64GB card that I shoot with and at the end of the day I move off what was shot. If I'm shooting on vacation I'll generally leave a copy of the images on the card so that I have 2 copies floating around but I've yet to fill up the card.

This card probably isn't targeting the consumer market. I think smartphone cameras have cannibalized much of the Point-and-Shoot camera and PVR market. That being said, I think most consumers purchase one SD card when they buy their camera and it's the only card that camera ever sees.

I get what you're saying, and it is a concern, but there is a decent argument (to me, anyway) that with 1TB you probably won't be taking the card out to be fumbling with it in the first place. Even with on-location shooting, "I filled up a 1TB card, I need to archive it" is probably a good reason for a lunch break.

No one in their right mind would fill a 1TB card before swapping. That's an insane amount of potential lost. I could see it as a secondary backup disk in DSLR about it.

If you're recording 4K video, a terabyte is about two hours of recording time. Plenty of folks will fill that before swapping.

Nobody in their right mind would have thousands of photos with no backup, but most people never backup anything.

So what's your argument here, that you agree with me?

He is saying that people will fill a 1TB card before swapping exactly the same way that people often leave thousands of photos floating around without backup.