The flagship international flights have been very profitable for CO. They probably see no reason to change.

The question is...E+ would dilute the BF revenue, would that be offset by the revenue inflow of economy jumpers to E+? And if there is a gain is it worth the retro-fit capex, training, product development, and marketing?

We could argue either way. But if you are CAL, why take the risk when Int'l is doing relatively well?