If 1914 remained as start of Gods Kingdom in the JW calculation of times, this could be soon explained as if we already since then lived in the 1000 year millenium. Christ is already king since 1914 anyhow! The endtime and Armageddon-speculations would loose weight and the dogmas could be explained partly symbolical or shifted to the maximal end of that millenium as last war or period of trials between Satan and Jesus, in which with a bible study and support of gods organisation survival was possible.
In the view of the world JW became mainstream, get rid of the doomsday smell and all JW get more relaxed.
Wouldnt it be exciting to hear that we already lived in year 103 of Christs millenium (103 Anno millenium) instead of merely his nebulous heavenly kingdom ruling? This would also explain the large growth in the last 100 years and the future legal successes at courts to establilsh the religion as public institution. There is an earthly blessing happening already now!!!! Even Bro.Franz was happy to live longer than 1975.
Further would not the growing number of partakers speak volumes and support the idea that such a happening is only possible because we lived already now in a very blessed time of the millenium, in which already now the pouring out of spirit is really great, where princes of peace can be announted and look forward to a heavenly career as kings besides Jesus? The elder arrangement would become more important.
We could already begin now to build houses and have occupancy and thank Jehovah for this time of peace of the prince of peace. And slowly the process will come true, that God may be all things to everyone.
Without speculating 1914+1000 is the maximum prolongation of the endtimes, a large overlapping "generation"*1) that would end only 2914 (1000 A.M. anno mill.)
Footnote
1) "generation" = the generation of milleniumists, who all lived to see togehter the happenings during the same symbolic "DAY" of 1000 years Millenium (1000 years is one day ). Therefore they can be called a generation.