but how can they change their vote if there is no option now Continue until the unclaimed coins (that were not touched after the block #1990382) are swapped ?
They do not need to vote for this option, it was proclaimed before:
I will let the people to swap after the January, 2017, if their old coins were not touched after the block #1990382...
Also in the rules:
If you want to add more power to your vote, just send to yourself ["your voting address"] more coins (and vice versa).