Imagine the universe collapsing inwards under its own gravitational force. The central region would be relatively unaffected at first. Gravity pulling from all directions would cancel it out. The outer edges of the universe would be different. Gravity is pulling in one direction only for the farthest galaxies. Inwards. So the collapse begins with the outermost galaxies slowing and then slowly falling inwards. As this continues over billions of years the density of the outer universe increases. This increase in universal density on the fringes would exert an increasing gravitational force on the hitherto static central region. The core is pulled outwards in all directions to meet this inward falling outer universe. If the milky way resides in the central region of the universe then we would observe an accelerating expansion of the viewable universe. Ofcourse this is what astronomers have observed.
Is this theory plausible? If not please explain why. If it is possible that the universe is collapsing in this way then could we calculate the end of the universe from the rate of expansion?