I agree with Vanderhoven. They will never abandon the date nor its chronology but they will simply change the focus on it.
I also agree that some on the GB no longer believe or are very skeptical. Ray Franz said in ISOCF that even back in his time some GB members were saying they weren't sure about it anymore.
The fact that the pictures at the back of the new NWT translation does not mention Jesus' enthronement as king in 1914 but only Satan's ousting from heaven 'about' then is VERY telling imho and a strong clue of things to come.
I believe they will eventually de-link Christ's enthronement and the establishment of the Kingdom in heaven from the date and shift it to the great tribulation, along with the ousting of Satan and the demons, the ride of the four horsemen, and the resurrection of the dead 144k. All these events will be shifted to the great tribulation.
1914 will be watered down to mean nothing more than Jesus' PAROUSIA began in 1914 in a spiritual sense only, ie, as the 'messenger of the covenant' who came to his spiritual temple per Malachi 3:1, not as newly enthroned king. 1919 will remain as the year Jesus cleansed his spiritual temple and selected the Watchtower leadership as his FDS.
The vision of the giant tree chopped down in Daniel will be explained away as: the kingdom was only an unbanded tree stump in 1914 and began to regrow then, but Jesus is not enthroned until the tree is fully regrown at the outbreak of the great tribulation.
None of this will happen for quite a few years to come.