What does nimby have to do with this? The smelt has nothing to do with the fact that we will have years with less than 10" of rain. This means the water supply will be about 1/3 to 1/4 of normal. This is not so much political, it is basic math.
Also, digging a well is not an option. Here we drill wells. Many of the above wells I mentioned, the ones that dried up in the 70s, were in excess of 100' deep. Many go up to 400' deep. The option to dig a well, or deeper wells, or more wells does not work if the water table is depleted.
Here in fantasy land, we enact the most progressive environmental protections in the country. Climate change models predict CA will suffer the loss of annual snow pack and reduction in rain along with increased temperatures. We can change a little at a time now and make a graceful transition to the new environment, or we can pursue business as usual. If we sit back and wait, nature will force change... and that transition will be all at once, brutal, and not of our design.