@OP
"Prediction: Console hardware will be refreshed every 2 years this generation."
Wrong, console manufacters don't make money from hardware and they actually take loses in the first years until said hardware is cheap enough to make a profit so is not in their best interest to release a beefed up console with better specs every 2 years for the same price because their profit margins will dissapear and if they try to sell it at an increased price people won't buy them.
Apple for example releases a new phone evey year because their profit margin is very high.