Do you mean you intend to keep any coins that don't get swapped in 2017 for yourself? That could be a big share of all the existing coins. It would be better to burn any left over coins if half of them don't get swapped instead of making yourself a whale.
The remaining coins will belong to the 42 community, they will take a decision how to spend them via anonymous but transparent voting system. Voting will be available only for the holders. Each vote will have a power proportionally to the holder balance.