I saw kencode's post about nodeBB and looked at xeroc's github link for the import plugin.
I also run an SMF forum for a local community group. I really like nodeBB from what I saw, and it's integration with other popular social tools like slac. However, the import tool doesn't do a very good job of migrating important info like passwords. This may not be a big deal to many people but it would be for my community forum users.
Also, it means the sharebits bot will need to be updated (perhaps totally rewritten) to work under nodeBB. I don't know what that will entail, whether a big task or small.
As for migrating this forum it will require everyone to reset all of their info - avatar, notifications, password etc. We'd need to hear from BitSaphire on what level of effort would be required of them to accomplish such a migration.