Theres not some grand crypto plan, they probably will just accept them in apple pay one day. Maybe some nft related things. Thats about it.
Now if you wanted to change the whole system to where the government doesnt need authority over home titles anymore in any way (taxation, ownership enforcement, etc), then thats a possibility. Not saying this is a good or bad idea. Phones are harder for me to see this as ever a possibility because its really a partnership where Apple provides ongoing support.