I'm not sure that all 16 would come back with the restart.
I think it will likely depend on whether it is possible to restore character data.
If you can get the data and even if you want to skinny down the list, although there seems no technical or monetary reason to do so, it would still make sense to bring them all back. Announce a server closing notice for the servers you want to eliminate and let people transfer to a one of the remaining servers.
This doesn't deal with SG's but with the development tools being unavailable these would likely be boned in a server merge. However restoring all the servers might aid in the recovery of bases as well.
But if the data is not recoverable, pick like the top 8 server names via a poll and just use those. Always a good idea to let the community decide when you can to create buy in for change which is usually disliked.