I'd advise against keeping a head in the sand on this one and read what BDCP is proposing in these important draft stages. The BDCP has specifically avoided the issues of increased exports or export reduction. This is where they are running into trouble, but at this stage of the plan they have time to address this issue in an objective way before producing a final draft report.
BDCP left the door open on export limits with this in Chapter 4... "The regulatory mechanism of the ESA that will be used to provide regulatory coverage to the CVP contractors has yet to be determined. Also, it has not yet been determined if coverage will be provided or what mechanism may be used to provide coverage for 10 other diversions in specific areas of the Delta."
Personally, I'd like to see the conveyance built at the current size to deliver somewhat reduced water exports. Short of a significant increase in San Joaquin River flow there is no other way to stop the destructive backflow across the Delta. Also, something will have to be done to restore the dendritic stream pattern of the lower San Joaquin River. False River is the major (but not the only) offender.