The 1914 doctrine of the WTS was its core foundation doctrine all throughout the 20th century and is still held to this day.
Its was essentially the core doctrine which all over doctrines were created from. ie. " This Generation."
To eliminate it now and and say it was made from poor understanding or interpretation from the bible would a formidable challenge to make. One thing the WTS and its supporting leaders have been propagating for so many years is that the WTS/JWS was chosen by and is god's earthly arrangement.
Breaking apart from a doctrine that is firmly structured could potentially be damaging to that propagation as being the Chosen Organization.