I think 1914 is at the end of its tether now. When you put 1914 in the WT library cd search you can see the occurences drop off in the last 10-20 years. The 1914 doctrine use to get a good run in the publications, now in the Bible Teach book it is left to the appendix in the back pages.
I think they would like to ditch it but it is to messy. They have been proclaiming 'Look! Here is the Christ!' for a hundred years. I think they are trying reduce its significance by not harping on about it but it really is the foundation of the whole movement. They will have to stick with the date I believe.
That date already has no feel for younger ones. It's relevance is limited to WWI, Jesus becomes King, and something they read in the bible teach book. It does not inspire any urgency or have any faith strengthening value.
I might be thinking wishfully, but I reckon the WTS is on a slippery slope.