You might be right, but I just feel we are looking to re-invent the wheel.
I think it would totally change the feel of the game. Imagine one team is losing in the final minutes of a big game, and everyone rushes to take a throw in, to take a free kick. That 'pressure' is an important element of the game we enjoy - clock is ticking, we need to make a move.
I really hope we stay with the current set up of 90mins, and added time where the referee actually accounts for additional breaks in play.