Your naive solution just creates an even more gigantic stagnant stinky mess of a Salton "sea". The entire point is to reengineer the salton sea as a beautiful ecosystem and lake by diluting all the salt with 5MAF of RO desalinated water. The added benefit is huge economic revitalization of the entire area. Plus, because of the value of minerals in the brine, and the cost-effectiveness of solar power, it is not as expensive and crazy of an idea as one might think.