It just shows you how little analysts really know...

The 787 is at best a niche airframe for long thin routes beyond the range of the 7ER.

For everything else it has almost the same cabin footprint of the 7ER but weighs 40k more. On routes the 7ER can service there is no economic benefit going with a 787 just the extra capital cost associated with a new airframe. The fuel savings of the engines and airframe are soaked up by the extra weight. As much as it pains me Delta made the right call to refurbish the 7ER cabin and wait for Boeing to figure out how to really work the advantages of carbon fiber in later versions of the jet...

Cheers
George