You meant 16GB card right? Otherwise basically 1 to 2 pictures per card.
To expand on the "failure" part, it's not that the SD cards are actually more prone to fail at higher GB, but the risk involving using higher storage cards. If you have a 128GB card in your DSLR, it could hold over 5,000 pictures even when shooting in RAW. At JPG, it could hold over 30,000 pictures. If your card can hold that many, you could get lazy and not offload from the SD card until it gets nearly full, which could take weeks/months/years. Where as, with a 16GB card, you have to change out the card much more frequently. Since you have to back up more often, there is a less chance of failure. Many casual photographers might not offload pics from their SD card for several months.
I've always used a 16GB card or smaller for my DSLR. Until last year. I finally got two 32GB cards. Mainly because I found myself shooting a lot of videos, and they eat up a lot of storage really fast. Which leads me to:
With videos, it's the same but different. The file size of a typical 4K video is much larger than a still photo. You want to take the same concept though and offload from your Mavic frequently. It's roughly 32GB per hour of 4K footage, so a 128GB can hold about 4 hours of video. Some people can fill that up in a day. I'd say that a 128GB card for a Mavic would be equivalent to a 16GB for a DSLR.
