Terry,
the latest as to what "until he arrives" mean: (W10 3/15 27)
Paul also helps us to understand that those with an earthly hope do not partake of the Memorial emblems. He said to anointed Christians: “For as often as you eat this loaf and drink this cup, you keep proclaiming the death of the Lord, until he arrives.” ( 1 Cor. 11:26 ) When does the Lord ‘arrive’? When he comes to take the last of his anointed bride class to their heavenly home. ( John 14:2, 3 ) Clearly, the annual observance of the Lord’s Evening Meal is not to continue endlessly. “The remaining ones” of the woman’s seed yet on earth will continue to partake of this meal until all of them have received their heavenly reward. ( Rev. 12:17 ) If, though, those who will live forever on earth were entitled to partake of the emblems, then this Memorial meal would need to continue forever.
I guess this makes the "cause"