I wouldn't call it much of a wishlist because these are the features that I believe a realistic mode should add. Except that you are trying to combine gameplay realism and aesthetic realism into one mode. They are not the same.
Also I would have to say in minecraft, when ever you are on fire the character is full body burning which would only be treated by extreme care. In your system, you'd only have 5 hearts. You could fly right through a single block of fire, be touching it for less than a second, and you'd catch on fire and burn to death in under 5 seconds. Why? Because it's basically doing 4 times the normal damage (Because the Max Health is halved and the Fire Damage is doubled), and because Minecraft doesn't treat fire differently under different circumstances.
I doubt Steve would be able to walk back to his diamond castle when he is burned. It's nigh impossible to build a diamond castle even in normal survival mode, so your argument is 50% invalid. Finally adding the whole list together would make the game somewhat realistic. It's already somewhat realistic, depending on your definition of somewhat. Water puts out fire, fire spreads, sand falls, you fall, pickaxes mine faster than by hand, armor keeps you from dying as quickly...
Also, you would die instantly at any health from falling 16.5 feet. There are many recorded cases of people surviving a drop that size. Also, you would become crippled at 9.9 feet. That might sound like a great height, but it really isn't that much. That would be the equivalent of falling out of a small tree.
I support the idea of a realism mode, but this isn't exactly how I would go about it. A lot of the changes seem entirely arbitrary and/or add very little to the game. Others, like the gravity system, seem likely to make the game well-nigh unplayable.
I think every game developer by now knows that adding a dose of realism to their video game is nice, but making it too realistic simply spoils the fun of the video game. After all, video games were originally created to be anything BUT realistic.
Also, you would die instantly at any health from falling 16.5 feet. There are many recorded cases of people surviving a drop that size. Also, you would become crippled at 9.9 feet. That might sound like a great height, but it really isn't that much. That would be the equivalent of falling out of a small tree.