I think they would love to get rid of 1914 but don't know how to do it. As has been pointed out not only do they claim Christ came back in 1914 but also that he hung around a while looking at all the Christian religions and for some odd reason chose them. Their whole authority as the one true religion is based on Christ returning at that time and choosing them. If he didn't come back at that time then he didn't select them at that time so why listen to them?
They did sneak away from 1914 generation that wouldn't pass away thing so with a little effort they might come up with the right lie to make 1914 go away. At least for those who still want to put all their faith in a flawed organization.