Heathrow Harry, no way. The B748 and B787 series are aimed at totally different markets, routes and customers. B747-8 is aimed at the 450 seat long haul market up against the Airbus 380. B787 is aimed at the 300 seat long/medium hall market up against the Airbus A330.
The most likely winner of the Dreamliner fiasco is the Airbus A350.