It's a nightmare for surfers, swimmers and life Gaurds. I was part of surf rider in 2006 when we successfully blocked the project. All we had to do was mention the blocking of the view for, the boardwalk and the whole city was on our side.
wave wise, extending the beach out to deep water will cause waves to break directly onto the sand (shore break). Instead of breaking further out in long surfable waves. When the waves break further out this disipates the wave energy so that when they reach the swimming area they are much smaller and weaker and thus safer for swimmers.