It would violate the law, Betteridge's law of headlines with a question mark.
Those are always to be answered with NO!
Except in this case the answer is clearly "yes". Connect the grids as far and wide as possible, and let market forces drive production up and costs down. The argument that "but then Californians might sometimes be using dirty power from coal plants in Nevada" is just stupid, because while that might happen sometimes, it also means that people in other states will use more of CA's renewable power.
What matters isn't who uses which, but that we maximize the total use of renewables and minimize the total use of fossil fuels. Given that renewables are dramatically cheaper than fossil energy, this means that just letting the market work will move us in the right direction. Broad interconnection and competitive markets will serve to ensure that the cheapest and greenest energy sources are 100% used and never wasted, not until the whole western US has enough renewables that renewable output sometimes exceeds the consumption of the entire region. It will further encourage deployment of more and more super-cheap renewables, driving fossil energy gradually out of the market.
Note that it's also important that wholesale prices not be tightly regulated, that the market be free to seek proper price equilibrium. Why? Because it's important that it be possible for, say, gas peaker plants to be able to make an absolute killing in the rare cases that available renewables fall short, so that power companies are motivated to operate and maintain those plants -- or to replace them with energy storage systems (battery, pumped hydro, whatever) so that those can make a killing when they're needed.
If at some point we fall into a local minimum where the market isn't incentivizing the shift to renewables + storage, then it will make sense to find some way to intervene with regulation. But, again, the best strategy will be to harness the market. For example, just internalize the carbon emission externality by applying a carbon tax, then let the market work out the power balance -- which could even include fossil fuel plants with carbon capture systems, who knows? At the present, though, costs favor renewables even with the carbon externalities of fossil plants.