Superb idea but not yet realistic unfortunately.
FOR
More lift
Less drag
Quieter
Less fuel used
Many pax
Good resistance in the event of a crash
Engines on top so no debris will enter
AGAINST
Evac would be tough
Flying wings are INHERENTLY (read inherently) unstable...but they CAN be stabilised
Engines on the top at the rear so they arne't exposed to clean air like conventional engines
Bad longitudinal stability
Pax would have very few windows
Pax sitting at the sides would experience a seriously sickening oscillatory motion
Pressurisation would be tough
Even at low angles of attack, the engines would be starved of air leading to bad performance and in some cases compressor stall.
It's too big to park.
Variants would not exist, and even if they did they would have to be redesigned aerodynamically which would be expensive.
Naaah not for a few years