Something like this for the consumer means insta-booting. Your computer will work like your tv or microwave - you push the button and it's ready to go.
But it also makes it even easier to steal data should someone gets access to your computer.
One of the easiest ways of bypassing security systems is through cold boot attack. Turn on computer, freeze the RAM sticks with compressed air to reduce memory bit loss, plug them into another device where you can recover lost bits (since bits are lost in a predictable pattern upon power loss), and read the data contents.
By ensuring that the RAM is never erased even when unplugged, you just made a hacker's dream come true.