Bitcoin fails 1, 3, 5, and 7.
It is not durable in a practical sense because it relies on a global P2P network to work. Governments have taken their countries off the internet before. How do you spend your bitcoins during civil unrest when you can't access the network?
How do you access your bank account via an ATM when the connection is down? Oh Noes! Any type of money accessed via ATMs and Debit/credit cards is not... um, money?
It is also vulnerable to a 51% attack, which is well within the technological capabilities of many governments.
Get back to me one you figure out what would happen if one group help the majority of US Dollars (or any money)
It is not convenient because it relies on both parties having setup a bitcoin wallet and having an internet connection
A wallet is trivial to set up. And who doesn't have internet access these days?
If I want to buy a used car for 3 ounces of gold, all I have to do is hand the seller the gold and they can verify firsthand that it is real and then I get the title to the car.
That is not convenient because it relies on both parties having setup gold testing equipment. Oh, and don't you need to go online (or to the DMV) to register the transfer?
I've gone to estate sales where there was no cellular or other data service and was not aware of this beforehand. Someone trying to buy via Bitcoin would be SOL, people using gold, silver, or paper money would go on with business as usual.
Where are you buying land that there is no cell service? (Note: not at the property itself, but at the real estate office (or whatever) where you buy it).