I have thought for quite a while that the simple instruction for everybody to partake of the emblems could be done to avoid having to take count of the ever-increasing "remnant". It might make it possible to hang on to the literal 144,000 - in theory, they could still be around, just not counted at the memorial. After all, there is absolutely nothing biblically that teaches a "second class of christians who do not take the Lord's evening meal."
Of course, then I realize that this is probably not realistic - the JW heirarchy is much too dependent on the "two-class" system and much of that comes from the idea of the annointed being reinforced as the only ones in the new covenant and the only ones fit to partake.
I think 1914 probably has to stay with them - even if it becomes more and more meaningless over the years. Probably some new "time period" could be thought up to cover it - they have already muddled the generation so badly that it cannot be likely touched for ten or more years now.
It is pathetic to have at least three basic doctrines which are ticking time bombs with no realistic way out other than to admit they were flat wrong.