Yes there will be at least 4ph, possibly 6tph from Elephant and Castle that terminate Blackfriars. Some of these will come from Herne Hill. This happens today (albeit not 4tph) and will continue to happen post 2018.
As Class377/5 states, Central turnbacks at Blackfriars would have meant that all northbound services from London Bridge would have to cross all southbound services to Elephant and Castle, including those starting at Blackfriars. Not realistic.
Re London Bridge, all trains departing the terminating platforms heading for New Cross Gate will be routed via the Down Slow through the dive under; the 'fast' trains will then swap to the 'fast' line at Bricklayers Arms Junction.
As Class377/5 states, Central turnbacks at Blackfriars would have meant that all northbound services from London Bridge would have to cross all southbound services to Elephant and Castle, including those starting at Blackfriars. Not realistic.
Re London Bridge, all trains departing the terminating platforms heading for New Cross Gate will be routed via the Down Slow through the dive under; the 'fast' trains will then swap to the 'fast' line at Bricklayers Arms Junction.
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