All Icecaps Melting?

If all the icecaps and glaciers melted, i think the seawater in all the oceans would rise dramatically and cause many places if not most of the world to be flooded. That would also be the end of the vast majority of our freshwater reserves. All that ice melting would also reduce the oceans temperatures greatly and do mive damage to the ocean ecosystem (coral reefs, fish, tropical aquatic organisms etc.) The greenland ice sheet has enough water to raise the world wide sea level by about 23 feet by itself!