There is no reason we cant use all of those technologies. When the wind is blowing and sun is shining and waves are crashing the regular power plants wont have to output as much or use as much resources. But thinking that somehow in the next 30-50 years we could get all of our energy from renewable sources isnt realistic IMO.
America has already reduced its consumption of oil by about 7%. I dont see why we cant drill our own oil and use regional renewable sources instead of giving millions of $$ to OPEC nations that hate us. Maybe NOT giving money to Middle eastern oil nations would do more to win the war on terrorists than fighting them.