Well the fact that 1914 is based on an incorrect date to start with and an incorrect calculation 1914 has no basis in the bible...so it does need to change...but that fact that as mentioned it is pretty much the keystone of the JW's belief's it's hard to see them change it.
One thing is for sure though, if they do change it and most of the jdubs accept it then the GB have won...because if jdubs accept a change in that then they will accept everything and anything the GB say...
The GB have got away with changing the FDS and the Generation...will they take the risk and change 1914? Their reasoning will need to be pretty convincing...cue terms like "evidently" and "obviously this is what Jehovah meant".