"A passenger pod is not heavy because it does not contain fuel, engines, avionics, etc., so in case of an accident it can be ejected and land on parachutes."
It contains the passengers (the payload) and is one of the major structural components of the plane, so it is heavy anyway. And if it has to be structurally sound enough to be ejected and land it will be even heavier. Big parachutes for heavy loads are not easy or lightweight too.
Besides, air travel is very safe already and this wouldn't change anything about crashes during take-off and landings.
I mean, yes, do designs and try to sell them. I doubt someone will buy this though.