

its worse than comparing it to physical media that has all content on media, but better than display boxes that only has a digital code in it.
digital key carts are more replacing the latter (which is better) but there will definitely be a few devs who will opt out of physical media storage costs for the key card
outside of the official service, there is actually one other feature that people forget exists, and would be relevent to the resell of the key.
updating by local user (no not the recently announced game sharing stuff, but the ability to update a game via just being near a device with the update)
edit: of course, this will only work if nintendo okays the transfer of the BASE game instalation as well. time will tell if its possible or not, as its a situation thats functionalyl hard to test.