This. Since February 2009, when Google released Google Earth 5.0, adding the animated waves [1], I've being thinking that eventually, they could actually make a nicer animated coastline, like in so many games now. But comparing the satellite view, with the map view, maybe the resolution is not currently good enough to make the simulated water overlap perfectly the pictures and make the coast look nice.

[1] http://www.gearthblog.com/blog/archives/2009/02/post_3.html