Good question....when all the NAUT have been redeemed is the answer, in theory.
So far, just over 3.5 million NAUT have been converted to NXTNAUT, from an original supply of 5.3 million.
This leaves around 1.8 million NAUT still out there, and I know the locations/holders of around 1 million of that (i think).
A lot of NAUT went down with MintPal, so that will probably never be recoverable.
Here's the block explorer and rich list, the top 3 accounts are under my control:
http://naut.blockexp.info/richlistThere are currently 3 main exchanges on board with Nautilus, and the Drachmae projects native exchange is coming soon, so I'm fairly sure that there will be ways to redeem old NAUT to NXTNAUT for a while longer. However, as all economic activity will be on NXTNAUT, the NAUT network will lose support and transfers may become difficult.
I'm committed to running this redemption program for a week or 2/3 longer, in any case.
Like I said earlier, we'll announce any cut-off date for swaps far in advance.
TL,DR:
not yet