Somethings missing here
The expected response to this accident would be to determine the source and quantity of the fuel, the probable ignition and how the fire got into the cabin so quickly. Then to define a corrective action program and time frame which would then be the news story.
To say that you don't know the answers to those post incident fundamental question and that the type must be grounded is astounding.
I grant you that it does take some time to understand all the details, but on the basis of a single accident you rarely ground (remove from service all aircraft) a large established fleet unless you already have replacement aircraft available to fill the gap.
edited to add:
it seems that a dual running thread on this accident has provided the missing info