B6 cannot really grow more at LGB so the only way to increase the value of the operation is to get higher yielding fares. That's where the Mexico service was going to play a role. Without that the company is flying a bunch of intra-California stuff mostly at fares too low to be a good use of resources.
I love the terminal there and hope JetBlue comes up with a way to make it work. But without the ability to expand or to grow yields it is hard to see what the future is.