Well, they do argue that anyway, but I don't think it is strong enough to replace the "generation" teaching. The Overlap is just sily. If they plug that I think it will just be counterproductive.
Someone mentioned the 120 years God set in Noah's day (Gen6:3). So far they have missed that trick. They might use it when it gets to 2025, just like they started saying 1975 in 1966 (I think), however, by that time they might be better dropping the 1914 date. Far too stale by then.
They will just have to use the general argument that there are wars and disasters etc. Nice and general.